Cisco chapter 5

CCNA 4 Chapter 5 v5 0 Exam Answers

1 Typically, which network device would be used to perform NAT for a corporate environment?

DHCP server
host device
router
server
switch

2 What is the group of public IPv4 addresses used on a NAT-enabled router known as?

outside local addresses
inside local addresses
inside global addresses
outside global addresses

3 When NAT is employed in a small office, which address type is typically used for hosts on the local LAN?

private IP addresses
global public IP addresses
Internet-routable addresses
both private and public IP addresses

4 Which version of NAT allows many hosts inside a private network to simultaneously use a single inside global address for connecting to the Internet?

PAT
static NAT
dynamic NAT
port forwarding

5 Which type of NAT maps a single inside local address to a single inside global address?

dynamic
static
port address translation
overloading

6 Several key servers in an organization must be directly accessible from the Internet. What addressing policy should be implemented for these servers?

Use dynamic NAT to provide addresses for the servers.
Place all of the servers in their own Class C private subnet.
Use DHCP to assign addresses from the pool of Class B addresses.
Assign static internal addresses and public external addresses to each of the servers

7 What is a disadvantage of NAT?

There is no end-to-end addressing.
The router does not need to alter the checksum of the IPv4 packets.
The internal hosts have to use a single public IPv4 address for external communication.
The costs of readdressing hosts can be significant for a publicly addressed network.

8

Refer to the exhibit. What has to be done in order to complete the static NAT configuration on R1?

R1 should be configured with the command ip nat inside source static 209.165.200.1 192.168.11.11.
R1 should be configured with the command ip nat inside source static 209.165.200.200 192.168.11.11.
Interface S0/0/0 should be configured with the command ip nat outside.
Interface Fa0/0 should be configured with the command no ip nat inside.

9

Refer to the exhibit. R1 is configured for NAT as displayed. What is wrong with the configuration?

Access-list 1 is misconfigured.
NAT-POOL2 is not bound to ACL 1.
Interface Fa0/0 should be identified as an outside NAT interface.
The NAT pool is incorrect.

10 Which statement accurately describes dynamic NAT?

It always maps a private IP address to a public IP address.
It provides an automated mapping of inside local to inside global IP addresses.
It provides a mapping of internal host names to IP addresses.
It dynamically provides IP addressing to internal hosts.

11 A network administrator configures the border router with the command R1(config)# ip nat inside source list 4 pool corp. What is required to be configured in order for this particular command to be functional?

a NAT pool named corp that defines the starting and ending public IP addresses
an access list named corp that defines the private addresses that are affected by NAT
an access list numbered 4 that defines the starting and ending public IP addresses
ip nat outside to be enabled on the interface that connects to the LAN affected by the NAT
a VLAN named corp to be enabled and active and routed by R1

12 When dynamic NAT without overloading is being used, what happens if seven users attempt to access a public server on the Internet when only six addresses are available in the NAT pool?

No users can access the server.
The request to the server for the seventh user fails.
All users can access the server.
The first user gets disconnected when the seventh user makes the request.

13 A network engineer has configured a router with the command ip nat inside source list 4 pool corp overload. Why did the engineer use the overload option?

The company has more private IP addresses than available public IP addresses.
The company needs to have more public IP addresses available to be used on the Internet.
The company router must throttle or buffer traffic because the processing power of the router is not enough to handle the normal load of external-bound Internet traffic.
The company has a small number of servers that should be accessible by clients from the Internet.

14

Refer to the exhibit. What will be the effect of entering the command that is shown in the exhibit on R2 as part of the dynamic NAT configuration?

It will define a pool of addresses for translation.
It will identify an inside NAT interface.
It will bind NAT-POOL1 with ACL 1.
It will define the source ACL for the external interface.

15 Which configuration would be appropriate for a small business that has the public IP address of 209.165.200.225/30 assigned to the external interface on the router that connects to the Internet?

access-list 1 permit 10.0.0.0 0.255.255.255
ip nat inside source list 1 interface serial 0/0/0 overload

access-list 1 permit 10.0.0.0 0.255.255.255
ip nat pool comp 192.0.2.1 192.0.2.8 netmask 255.255.255.240
ip nat inside source list 1 pool comp

access-list 1 permit 10.0.0.0 0.255.255.255
ip nat pool comp 192.0.2.1 192.0.2.8 netmask 255.255.255.240
ip nat inside source list 1 pool comp overload

access-list 1 permit 10.0.0.0 0.255.255.255
ip nat pool comp 192.0.2.1 192.0.2.8 netmask 255.255.255.240
ip nat inside source list 1 pool comp overload
ip nat inside source static 10.0.0.5 209.165.200.225

16 What are two required steps to configure PAT? (Choose two.)

Define a pool of global addresses to be used for overload translation.
Define a standard access list denying the addresses that should be translated.
Define the range of ports to be used.
Identify the inside interface.
Define a standard access list that allow the outside global addresses to be used.

17

Refer to the exhibit. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router?

defines which addresses can be translated
defines which addresses are allowed into the router
defines which addresses are assigned to a NAT pool
defines which addresses are allowed out of the router

18 What is the purpose of port forwarding?

Port forwarding allows an external user to reach a service on a private IPv4 address that is located inside a LAN.
Port forwarding allows users to reach servers on the Internet that are not using standard port numbers.
Port forwarding allows an internal user to reach a service on a public IPv4 address that is located outside a LAN.
Port forwarding allows for translating inside local IP addresses to outside local addresses.

19 What is a characteristic of unique local addresses?

They allow sites to be combined without creating any address conflicts.
They are designed to improve the security of IPv6 networks.
Their implementation depends on ISPs providing the service.
They are defined in RFC 3927.

20

Refer to the exhibit. Based on the output that is shown, what type of NAT has been implemented?

dynamic NAT with a pool of two public IP addresses
PAT using an external interface
static NAT with one entry
static NAT with a NAT pool

21

Refer to the exhibit. The NAT configuration applied to the router is as follows:
ERtr(config)# access-list 1 permit 10.0.0.0 0.255.255.255
ERtr(config)# ip nat pool corp 209.165.201.6 209.165.201.30 netmask 255.255.255.224
ERtr(config)# ip nat inside source list 1 pool corp overload
ERtr(config)# ip nat inside source static 10.10.10.55 209.165.201.4
ERtr(config)# interface gigabitethernet 0/0
ERtr(config-if)# ip nat inside
ERtr(config-if)# interface serial 0/0/0
ERtr(config-if)# ip nat outside

Based on the configuration and the output shown, what can be determined about the NAT status within the organization?

Dynamic NAT is working, but static NAT is not.
Static NAT is working, but dynamic NAT is not.
NAT is working.
Not enough information is given to determine if both static and dynamic NAT are working. *

22 Based on the configuration and the output shown, what can be determined about the NAT status within the organization?

NAT is working.
Static NAT is working, but dynamic NAT is not.
Dynamic NAT is working, but static NAT is not.
Not enough information is given to determine if both static and dynamic NAT are working.

23

Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
What problem is causing PC-A to be unable to communicate with the Internet?

The static route should not reference the interface, but the outside address instead.
This router should be configured to use static NAT instead of PAT.
The ip nat inside source command refers to the wrong interface.
The access list used in the NAT process is referencing the wrong subnet.
The NAT interfaces are not correctly assigned.

24

Place the options in the following order: 
– not scored – 
step 5 
step 2 
step 4 
step 1 
step 3

25 
What are two of the required steps to configure PAT? (Choose two.)

Create a standard access list to define applications that should be translated.
Identify the inside interface.*
Define the range of source ports to be used.
Define the hello and interval timers to match the adjacent neighbor router.
Define a pool of global addresses to be used for overload translation.*

Cisco chapter 4

CCNA 4 Chapter 4 v5 0 Exam Answers

1.
What is a characteristic of Frame Relay that provides more flexibility than a dedicated line?

Customers use dedicated circuits in increments of 64 kb/s.
Dedicated physical circuits are installed between each site.
The Frame Relay cloud allocates as much bandwidth as required to active PVCs to maintain the connection.
One router WAN port can be used to connect to multiple destinations.

2
What are the two major criteria that constitute the cost of a Frame Relay circuit? (Choose two.)

QoS
end-to-end connectivity
local loop
required bandwidth
circuit management fees

3
A router interface connects to a Frame Relay network over a preconfigured logical circuit that does not have a direct electrical connection from end to end. Which type of circuit is being used?

SVC
hub and spoke
full mesh
dedicated leased line
PVC

4
Which Frame Relay topology provides a connection from every site to every other site and maintains a high amount of reliability?

hub and spoke
partial mesh
full mesh
star

5
Which technology allows a Layer 3 IPv4 address to be dynamically obtained from a Layer 2 DLCI?

Neighbor Discovery
Address Resolution Protocol
Inverse Neighbor Discovery
Inverse Address Resolution Protocol

6
A network administrator has statically configured the LMI type on the interface of a Cisco router that is running Cisco IOS Release 11.2. If the service provider modifies its own LMI type in the future, what step must the network administrator take?

The network administrator must modify the keepalive time interval to maintain connectivity with the LMI type of the service provider.
The network administrator does not have to do anything, because all LMI types are compatible with one another.
The network administrator must statically set the LMI type to be compatible with the service provider.
The network administrator simply has to verify connectivity with the provider, because the router has an LMI autosensing feature that automatically detects the LMI type.

7
Which two functions are provided by the Local Management Interface (LMI) that is used in Frame Relay networks? (Choose two.)

mapping of DLCIs to network addresses
error notification
congestion notification
simple flow control
exchange of information about the status of virtual circuits

8
Which parameter would be specified in a Frame Relay provider contract for a particular company?

DE
QoS
Inverse ARP enabled/disabled
CIR

9
Which three notification mechanisms are used when congestion is present in a Frame Relay network? (Choose three.)

DE
BECN
inverse ARP
CIR
FECN
DLCI

10
Why would a customer request a Frame Relay circuit with a CIR of zero?

to have a circuit used for network management traffic
to have a backup circuit for critical data transmissions
to have better QoS
to have a link with reduced costs
to have a circuit used for voice traffic

11
Which provider-negotiated parameter would allow a customer to send data above the rate of the bandwidth specified by the CIR?

DE
FECN
Be
Bc

12
What is the purpose of applying the command frame-relay map ip 10.10.1.2 110 broadcast?​

to support IPv6 traffic over the NBMA network by using DLCI 110
to allow Frame Relay frames to be broadcast over DLCI 110​
to allow Frame Relay frames to be broadcast toward host 10.10.1.2
to allow Frame Relay frames to be broadcast on all Frame Relay interfaces
to configure a device with a static Frame Relay map that also allows the forwarding of routing updates

13

Refer to the exhibit. Which two statements are correct? (Choose two.)

The IPv4 address of interface S0/1/0 on RA is 192.168.1.2.
The IPv4 address of interface S0/1/1 on RB is 192.168.1.2.
The DLCI that is attached to the VC on RA to RB is 62.
The DLCI that is attached to the VC on RB to RA is 62.
The Frame Relay map was set by using the command frame-relay map.

14

Refer to the exhibit. Which statement is true about Frame Relay traffic on R1?

Traffic that exits subinterface Serial 0/0/0.102 is marked with DLCI 201.
Traffic on Serial 0/0/0 is experiencing congestion between R1 and the Frame Switch.
Traffic that is mapped to DLCI 201 will exit subinterface Serial 0/0/0.201.
Frames that enter router R1 from a Frame Relay neighbor will have DLCI 201 in the frame header.

15
Which three actions can be taken to solve Layer 3 routing protocol router reachability issues when using Frame Relay? (Choose three.)

Use subinterfaces.
Disable Inverse ARP.
Use a full mesh topology.
Use the keyword cisco as the LMI type.
Disable split horizon.
Configure static DLCI mappings.

16
When would the multipoint keyword be used in Frame Relay PVCs configuration?

when multicasts must be supported
when using physical interfaces
when participating routers are in the same subnet
when global DLCIs are in use

17
A network engineer has issued the interface serial 0/0/1.102 point-to-point command on a router that will be communicating with another router over a Frame Relay virtual circuit that is identified by the DLCI 102. Which two commands would be appropriate for the network engineer to issue next? (Choose two.)

no shutdown
no ip address
encapsulation frame relay
ip address 10.1.1.10 255.255.255.252
frame-relay interface-dlci 102

18
Which two Frame Relay router reachability issues are resolved by configuring logical subinterfaces? (Choose two.)

LMI status inquiry messages sent to the network are not received.
Inverse ARP fails to associate all IP addresses to the correct DLCIs.
Frame Relay is unable to map a remote IP address to a DLCI.
Distance vector routing protocols are unable to forward routing updates back out the incoming interface to other remote routers.
Link-state routing protocols are unable to complete neighbor discovery.

19

Refer to the exhibit. A network administrator has implemented the show interfaces serial 0/1/0 command. What can be verified from the displayed output?

Router R1 connects to multiple sites through the serial 0/1/0 interface.
Router R1 is forwarding traffic on interface serial 0/1/0 using the local DLCI 1023.
Router R1 is not using the default LMI type.​
Router R1 has been configured with Frame Relay via the ietf keyword.

20
The show frame-relay pvc command is best utilized to display the number for which type of packets that are received by the router?

FECN and BECN messages
Inverse Neighbor Discovery messages
Inverse ARP messages
LMI status messages

21

Refer to the exhibit. A network administrator is configuring Frame Relay subinterfaces on R1. A distance vector routing protocol has also been configured. Data is routing successfully from R1 to networks that are connected to R2, R3, and R4, but routing updates between R2 and R3 are failing. What is the possible cause of this failure?

Split horizon is preventing successful routing table updates on the multipoint link.
Multipoint Frame Relay networks cannot be used with this IP addressing scheme.
Subinterfaces cannot be used on multipoint Frame Relay links.
Two DLCI identifiers cannot be configured on one subinterface.

22

Refer to the exhibit. A network administrator issues the show frame-relay map command to troubleshoot the Frame Relay connection problem. Based on the output, what is the possible cause of the problem?

The S0/0/1 interface of the R2 router is down.
The IP address on S0/0/1 of R3 is configured incorrectly.
Inverse ARP is providing false information to the R1 router.
The S0/0/1 interface of the R2 router has been configured with the encapsulation frame relay ietfcommand.
The Frame Relay map statement on the R3 router for the PVC to R2 is configured with an incorrect DLCI number.

23
Fill in the blank. Use an acronym.
The Frame Relay “DLCI” identifies a connection from one endpoint to a remote destination.

24

Fill in the blank.
The encapsulation frame-relay “ietf” command enables Frame Relay encapsulation and allows connection to a device from a different vendor.

25

Place the options in the following order: 
[+] customers pay for an end-to-end connection 
[+] customers do not share the line 
[+] requires more equipment to purchase and maintain 
[+] used in one-to-one network link only

[#] used in one-to-many networks 
[#] uses virtual circuits 
[#] customers share bandwidth

[+] Order does not matter within this group.
[#] Order does not matter within this group.

Cisco chapter 3

CCNA 4 Chapter 3 v5 0 Exam Answers

1.
Which address is used in the Address field of a PPP frame?

a single byte of binary 10101010
a single byte of binary 11111111*
the IP address of the serial interface
a single byte of binary 00000000

2
How does PPP interface with different network layer protocols?

by specifying the protocol during link establishment through LCP
by encoding the information field in the PPP frame
by using separate NCPs*
by negotiating with the network layer handler

3

Place the options in the following order: 
Compression 
Multilink 
Maximum Receive Unit 
– not scored – 
Authentication Protocol

4
Which command can be used to view the cable type that is attached to a serial interface?

Router(config)# show controllers*
Router(config)# show ip interface
Router(config)# show interfaces
Router(config)# show ip interface brief

5
In which situation would the use of PAP be preferable to the use of CHAP?

when plain text passwords are needed to simulate login at the remote host*
when router resources are limited
when multilink PPP is used
when a network administrator prefers it because of ease of configuration

6
Which protocol will terminate the PPP link after the exchange of data is complete?

IPCP
LCP*
IPXCP
NCP

7

Refer to the exhibit. Which statement describes the status of the PPP connection?

Both the link-establishment and network-layer phase completed successfully.*
Only the network-layer phase completed successfully.
Only the link-establishment phase completed successfully.
Neither the link-establishment phase nor the network-layer phase completed successfully.

8
Which is an advantage of using PPP on a serial link instead of HDLC?

option for session establishment
higher speed transmission
option for authentication*
fixed-size frames

9
Which three statements are true about PPP? (Choose three.)

PPP can use synchronous and asynchronous circuits.*
PPP carries packets from several network layer protocols in LCPs.
PPP can only be used between two Cisco devices.
PPP uses LCPs to agree on format options such as authentication, compression, and error detection.*
PPP uses LCPs to establish, configure, and test the data link connection.*

10
When configuring Multilink PPP, where is the IP address for the multilink bundle configured?

on a subinterface
on a physical serial interface
on a physical Ethernet interface
on a multilink interface*

11
Which field marks the beginning and end of an HDLC frame?

FCS
Flag*
Control
Data

12

Refer to the exhibit. Based on the debug command output that is shown, which statement is true of the operation of PPP.

Both PAP and CHAP authentication were attempted.
A PPP session was successfully established.*
CHAP authentication failed because of an unknown hostname.
The debug output is from router R2.

13
During a PPP session establishment phase, which two messages are sent by the requested party if the options are not acceptable? (Choose two.)

Configure-Reject*
Code-Reject
Discard-Request
Configure-Nak*
Protocol-Reject

14
A network administrator is evaluating authentication protocols for a PPP link. Which three factors might lead to the selection of CHAP over PAP as theauthentication protocol? (Choose three.)

uses an unpredictable variable challenge value to prevent playback attacks*
uses a three-way authentication periodically during the session to reconfirm identities*
transmits login information in encrypted format*
control by the remote host of the frequency and timing of login events
establishes identities with a two-way handshake
makes authorized network administrator intervention a requirement to establish each session

15

Place the options in the following order: 
Step 3 
Step 2 
Step 4 
Step 1 
– not scored – 
Step 5 
Step 6

16
What are three components of PPP? (Choose three.)

LCP*
multilink
NCP*
HDLC-like framing*
compression
authentication

17

Refer to the exhibit. A network administrator is configuring the PPP link between the two routers. However, the PPP link cannot be established. Based on the partial output of the show running-config command, what is the cause of the problem?​

The passwords do not match.*
The usernames do not match.
The passwords should be longer than 8 characters.
The interface IP addresses are in different subnets.

18
Which PPP option can detect links that are in a looped-back condition?

Magic Number*
Callback
MRU
ACCM

19
Which three are types of LCP frames used with PPP? (Choose three.)

link-negotiation frames
link-acknowledgment frames
link-maintenance frames*
link-termination frames*
link-establishment frames*
link-control frames

20
At which layer of the OSI model does multiplexing take place?

Layer 3
Layer 4
Layer 2
Layer 1*

21

Place the options in the following order: 
Phase 3 
– not scored – 
Phase 1 
Phase 2

22
Which three physical layer interfaces support PPP? (Choose three.)

GigabitEthernet
asynchronous serial*
HSSI*
synchronous serial*
POTS
FastEthernet

23

Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
Why is the serial link between router R1 and router R2 not operational?

The encapsulation in both routers does not match.
The passwords are different in both routers.
In each case the expected username is not the same as the remote router hostname.*
The authentication type is not the same in both routers.

24
Which serial 0/0/0 interface state will be shown if no serial cable is attached to the router, but everything else has been correctly configured and turned on?

Serial 0/0/0 is up, line protocol is down
Serial 0/0/0 is administratively down, line protocol is down
Serial 0/0/0 is up (disabled)
Serial 0/0/0 is up, line protocol is up
Serial 0/0/0 is down, line protocol is down*
Serial 0/0/0 is up (looped)

Cisco Chapter 2

CCNA 1 Chapter 2 V4.0

1. Which statements correctly identify the role of intermediary devices in the network? (Choose three.)
determine pathways for data
initiate data communications
retime and retransmit data signals
originate the flow of data
manage data flows
final termination point for data flow

2. Select the statements that are correct concerning network protocols. (Choose three.)
define the structure of layer specific PDU’s 
dictate how to accomplish layer functions
outline the functions necessary for communications between layers 
limit the need for hardware compatibility
require layer dependent encapsulations 
eliminate standardization among vendors

3. What are two functions of encapsulation? (Choose two.)
tracks delay between end devices
enables consistent network paths for communication
allows modification of the original data before transmission
identifies pieces of data as part of the same communication 
ensures that data pieces can be directed to the correct receiving end device

4. What is a primary function of the trailer information added by the data link layer encapsulation?
supports error detection 
ensures ordered arrival of data
provides delivery to correct destination
identifies the devices on the local network
assists intermediary devices with processing and path selection

5. Which two layers of the OSI model have the same functions as the TCP/IP model Network Access Layer? (Choose two.)
Network
Transport
Physical 
Data Link
Session

6. What is a PDU?
corruption of a frame during transmission
data reassembled at the destination
retransmitted packets due to lost communication
a layer specific encapsulation

7. Which characteristic correctly refers to end devices in a network?
manage data flows
originate data flow 
retime and retransmit data signals
determine pathways for data

8.

ccna 1 chapter 2

Refer to the exhibit. “Cell A” at IP address 10.0.0.34 has established an IP session with “IP Phone 1″ at IP address 172.16.1.103. Based upon the graphic, which device type best describes the function of wireless device “Cell A?”
the destination device
an end device
an intermediate device
a media device

9.

ccna 1 chapter 2

Refer to the exhibit. Which three labels correctly identify the network types for the network segments that are shown? (Choose three.)
Network A — WAN
Network B — WAN
Network C — LAN
Network B — MAN
Network C — WAN
Network A – LAN

10. Which three statements best describe a Local Area Network (LAN)? (Choose three.)
A LAN is usually in a single geographical area.
The network is administered by a single organization.
The connection between segments in the LAN is usually through a leased connection.
The security and access control of the network are controlled by a service provider.
A LAN provides network services and access to applications for users within a common organization.
Each end of the network is generally connected to a Telecommunication Service Provider (TSP).

11.

ccna 1 chapter 2

Refer to the exhibit. Which networking term describes the data interleaving process represented in the graphic?
piping
PDU
streaming
multiplexing
encapsulation

12. What is the primary purpose of Layer 4 port assignment?
to identify devices on the local media
to identify the hops between source and destination
to identify to the intermediary devices the best path through the network
to identify the source and destination end devices that are communicating
to identify the processes or services that are communicating within the end devices

13. What device is considered an intermediary device?
file server
IP phone
laptop
printer
switch

14.

ccna 1 chapter 2

Refer to the exhibit. Which term correctly identifies the device type that is included in the area B?
source
end
transfer
intermediary

15.

ccna 1 chapter 2

Refer to the exhibit. What type of network is shown?
WAN
MAN
LAN
WLAN

16. Which layer encapsulates the segment into packets?
physical
data link
network
transport

17. What can be identified by examining the network layer header?
the destination device on the local media
the destination host address
the bits that will be transferred over the media
the source application or process creating the data

18.

ccna 1 chapter 2

Refer to the exhibit. Which set of devices contains only end devices?
A, C, D
B, E, G, H
C, D, G, H, I, J
D, E, F, H, I, J
E, F, H, I, J

19. During the encapsulation process, what occurs at the data link layer?
No address is added.
The logical address is added.
The physical address is added.
The process port number is added.

20. What is the purpose of the TCP/IP Network Access layer?
path determination and packet switching
data presentation
reliability, flow control, and error detection
network media control
the division of segments into packets

21. What is the proper order of the layers of the OSI model from the highest layer to the lowest layer?
physical, network, application, data link, presentation, session, transport
application, physical, session, transport, network, data link, presentation
application, presentation, physical, session, data link, transport, network
application, presentation, session, transport, network, data link, physical
presentation, data link, session, transport, network, physical, application