chapter 2 Flashcards
Which three are types of LCP frames used with PPP? (Choose three.)
link-establishment frames link-control frames link-negotiation frames link-termination frames link-acknowledgment frames link-maintenance frames
- link-establishment frames
- link-termination frames
- link-maintenance frames
Which command can be used to view the cable type that is attached to a serial interface?
Router(config)# show ip interface brief
Router(config)# show ip interface
Router(config)# show interfaces
Router(config)# show controllers
Router(config)# show controllers*
How does PPP interface with different network layer protocols?
by using separate NCPs
by encoding the information field in the PPP frame
by specifying the protocol during link establishment through LCP
by negotiating with the network layer handler
by using separate NCPs*
Which address is used in the Address field of a PPP frame?
a single byte of binary 10101010
a single byte of binary 11111111
a single byte of binary 00000000
the IP address of the serial interface
a single byte of binary 11111111*
Which field marks the beginning and end of an HDLC frame?
FCS
Data
Control
Flag
*Flag
In which situation would the use of PAP be preferable to the use of CHAP?
when router resources are limited
when multilink PPP is used
when a network administrator prefers it because of ease of configuration
when plain text passwords are needed to simulate login at the remote host*
when plain text passwords are needed to simulate login at the remote host*
When configuring Multilink PPP, where is the IP address for the multilink bundle configured?
on a physical serial interface
on a multilink interface
on a physical Ethernet interface
on a subinterface
on a multilink interface*
Refer to the exhibit. Based on the debug command output that is shown, which statement is true of the operation of PPP.
A PPP session was successfully established.
CHAP authentication failed because of an unknown hostname.
Both PAP and CHAP authentication were attempted.
The debug output is from router R2.
A PPP session was successfully established.*
The exhibit has two boxes. The first box shows the following partial command output:
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 usernames do not match.
The passwords should be longer than 8 characters.
The interface IP addresses are in different subnets.
The passwords do not match.*
The passwords do not match.
Which protocol will terminate the PPP link after the exchange of data is complete?
IPXCP
NCP
LCP
IPCP
*LCP
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 up
Serial 0/0/0 is up (looped)
Serial 0/0/0 is up (disabled)
Serial 0/0/0 is up, line protocol is down
Serial 0/0/0 is down, line protocol is down
Serial 0/0/0 is administratively down, line protocol is down
Serial 0/0/0 is down, line protocol is down*
How much total bandwidth is provided by a T1 line?
64 kb/s
1.544 Mb/s
128 b/s
43.736 Mb/s
1.544 Mb/s*
A network engineer is monitoring an essential, but poor quality, PPP WAN link that periodically shuts down. An examination of the interface configurations shows that the ppp quality 90 command has been issued. What action could the engineer take to reduce the frequency with which the link shuts down?
Set the DCE interface to a lower clock rate.
Use the bandwidth command to increase the bandwidth of the link.
Issue the command ppp quality 100.
Issue the command ppp quality 70.
Issue the command ppp quality 70.*
A network engineer is troubleshooting the loss of MPEG video viewing quality as MPEG video files cross a PPP WAN link. What could be causing this loss of quality?
Link Quality Monitoring was not configured correctly on each interface.
PAP authentication was misconfigured on the link interfaces.
The clock rates configured on each serial interface do not match.
The compress command was used when PPP was configured on the interfaces.
The compress command was used when PPP was configured on the interfaces.*
Which PPP option can detect links that are in a looped-back condition?
Callback
Magic Number
ACCM
MRU
Magic Number*
Refer to the exhibit. A network engineer has issued the show interfaces serial 0/0/0 command on a router to examine the open NCPs on a PPP link to another router. The command output displays that the encapsulation is PPP and that the LCP is open. However, the IPV6CP NCP is not shown as open. What does the engineer need to configure to open the IPV6CP NCP on the link?
Configure CHAP authentication on each router.
Issue the compress predictor command on each interface on the link.
Configure PPP multilink interfaces on each router.
Configure an IPv6 address on each interface on the link.
Configure an IPv6 address on each interface on the link.*
Which three physical layer interfaces support PPP? (Choose three.)
synchronous serial FastEthernet Ethernet GigabitEthernet asynchronous serial HSSI
- synchronous serial
- asynchronous serial
- HSSI
What are three components of PPP? (Choose three.)
authorization NCP HDLC-like framing LCP parallel communications support for LAN and WAN
NCP*
HDLC-like framing*
LCP*
Refer to the exhibit. What type of Layer 2 encapsulation will be used for connection D on the basis of this configuration on a newly installed router:
RtrA(config)# interface serial0/0/0
RtrA(config-if)# ip address 128.107.0.2 255.255.255.252
RtrA(config-if)# no shutdown
PPP
Ethernet
HDLC
Frame Relay
HDLC*
Which two statements describe a PPP connection between two Cisco routers? (Choose two.)
LCP tests the quality of the link.
LCP manages compression on the link.
NCP terminates the link when data exchange is complete.
With CHAP authentication, the routers exchange plain text passwords.
Only a single NCP is allowed between the two routers.
LCP tests the quality of the link.*
LCP manages compression on the link.*
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 authentication type is not the same in both routers.
The passwords are different in both routers.
In each case the expected username is not the same as the remote router hostname
*In each case the expected username is not the same as the remote router hostname
The maximum size of the PPP frame
Maximum Receive Unit
Authentication Protocol
Multilink
compression
*Maximum Receive Unit
The two choices are Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP).
Maximum Receive Unit
Authentication Protocol
Multilink
compression
*Authentication Protocol
Provides load balancing over the router interfaces.
Maximum Receive Unit
Authentication Protocol
Multilink
compression
*Multilink
Increases the effective throughput on PPP connections by reducing the amount of data in the frame that must travel across the link.
Maximum Receive Unit
Authentication Protocol
Multilink
compression
*compression
establish the link and negotiate configuration options
phase 1
determine the quality of the link
phase 2
negotiate the network layer to configure L3 protcol
phase 3
use LCP to negotiate the type of authentication
Step 1 Step 2 Step 3 Step 4 Step 5 Step 6
Step 1
calculate the ID and random number Step 1 Step 2 Step 3 Step 4 Step 5 Step 6
Step 2
calculate the MD5 hash Step 1 Step 2 Step 3 Step 4 Step 5 Step 6
Step 3
send the challenge ID, hash, and username Step 1 Step 2 Step 3 Step 4 Step 5 Step 6
Step 4
calculate the hash based on received information Step 1 Step 2 Step 3 Step 4 Step 5 Step 6
Step 5
compare the received hash with the calculated hash Step 1 Step 2 Step 3 Step 4 Step 5 Step 6
Step 6
