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Question 1 of 25
1. Question
1 pointsWhich three are types of LCP frames used with PPP? (Choose three.)Correct
Incorrect
Hint
Link-establishment frames establish and configure a link. Link-maintenance frames manage and debug a link. Link-termination frames terminate a link. -
Question 2 of 25
2. Question
1 pointsWhich command can be used to view the cable type that is attached to a serial interface?Correct
Incorrect
Hint
The show controllers command will allow an administrator to view the type of cable attached to a serial interface such as a V.35 DCE. -
Question 3 of 25
3. Question
1 pointsHow does PPP interface with different network layer protocols?Correct
Incorrect
Hint
PPP can support multiple network layer protocols, such as IPv4, IPv6, IPX, and AppleTalk. It handles the interface with various network layer protocols via separate NCPs. There is a protocol field in a PPP frame to specify the network layer protocol that is being used. The information field in a PPP frame is the data payload. LCP sets up and terminates a link. It does not check which network layer protocol is used for the data. -
Question 4 of 25
4. Question
1 pointsWhich address is used in the Address field of a PPP frame?Correct
Incorrect
Hint
Because PPP is point-to-point, it does not need to assign individual station addresses. The Address field in the frame is a single byte of binary sequence 11111111, the standard broadcast address. -
Question 5 of 25
5. Question
1 pointsWhich field marks the beginning and end of an HDLC frame?Correct
Incorrect
Hint
An HDLC frame consists of six or more fields. Two Flag fields are used to mark the beginning and the end of the frame. -
Question 6 of 25
6. Question
1 pointsIn which situation would the use of PAP be preferable to the use of CHAP?Correct
Incorrect
Hint
There are times when PAP should be used instead of CHAP. When a plain text password is needed to simulate login at a remote host, PAP is preferable, since passwords are not sent in clear text with CHAP. -
Question 7 of 25
7. Question
1 pointsWhen configuring Multilink PPP, where is the IP address for the multilink bundle configured?Correct
Incorrect
Hint
When configuring a PPP multilink bundle, the IP address will be configured on the multilink interface, not on the physical interface. This is because the multilink bundle is representing two or more physical interfaces. -
Question 8 of 25
8. Question
1 pointsThe exhibit displays some partial debug command output: Refer to the exhibit. Based on the debug command output that is shown, which statement is true of the operation of PPP.Correct
Incorrect
Hint
This debug output is from router R1 and shows that a PPP session was successfully established. Success can be verified by the line of output with CDPCP: State is open. -
Question 9 of 25
9. Question
1 pointsThe 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?Correct
Incorrect
Hint
In PPP authentication, the passwords are case sensitive and must match on both sides. -
Question 10 of 25
10. Question
1 pointsWhich protocol will terminate the PPP link after the exchange of data is complete?Correct
Incorrect
Hint
LCP terminates a link after exchange of data is complete by exchanging link-termination packets. The link may terminate for various reasons before the data exchange is complete. NCP will only terminate the network layer and NCP link. IPCP and IPXCP are specific network control protocols. -
Question 11 of 25
11. Question
1 pointsWhich 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?Correct
Incorrect
Hint
The show interfaces privileged exec mode command shows the state of the interfaces, along with much other information that related to them. “Serial 0/0/0 is down, line protocol is down” is displayed if there is no cable connected because there is no Layer 1 or Layer 2 activity going on. The interface has been turned on by the use of the no shutdown command, otherwise the “Serial 0/0/0 is administratively down, line protocol is down” message would be displayed, whether a cable has been connected or not. -
Question 12 of 25
12. Question
1 pointsHow much total bandwidth is provided by a T1 line?Correct
Incorrect
Hint
A T1 line consists of 24 voice channels with 64 kb/s each of bandwidth. This gives a T1 link a total bandwidth of 1.544 Mb/s. -
Question 13 of 25
13. Question
1 pointsA 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?Correct
Incorrect
Hint
Issuing the ppp quality 70 command will reduce the link quality threshold before it shuts down from 90% of packets received that were sent, to a drop rate of 70% before shutting down. Setting the threshold to 100% will shut down the link if 100% of packets are not received. Lowering the clock rate will not help a link that is going down. The bandwidth command is used for routing protocol calculations, not link quality. -
Question 14 of 25
14. Question
1 pointsA 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?Correct
Incorrect
Hint
Using the compress command when configuring PPP on interfaces can reduce the system performance due to a software compression process. The reduced performance may reduce the content delivery quality, especially in the case of audio and video streaming, such as MPEG file streaming. When compressed data files, such as .mpeg, .zip, and .tar files, are carried on the link, using the compress command is not recommended. If PAP is used but misconfigured, the PPP link will not work at all. The clock rate is needed only on the DCE side of a serial link. Configuring Link Quality Monitoring will only monitor the incoming and outgoing link quality. Link Quality Monitoring is not sensitive to which type of content is transmitted. -
Question 15 of 25
15. Question
1 pointsWhich PPP option can detect links that are in a looped-back condition?Correct
Incorrect
Hint
A Magic Number is randomly generated by PPP at each end of the connection. This number is used by the devices at each end to detect a looped-back condition. -
Question 16 of 25
16. Question
1 pointsA 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?Correct
Incorrect
Hint
The PPP IPV6CP NCP will open when the interface on each router is configured with an IPv6 address. -
Question 17 of 25
17. Question
1 pointsWhich three physical layer interfaces support PPP? (Choose three.)Correct
Incorrect
Hint
PPP can operate across any DTE/DCE interface in either asynchronous or synchronous bit serial mode. The high-speed serial interface (HSSI) developed by Cisco Systems and T3 plus Networking is a DTE/DCE interface that provides high speed connectivity. Asynchronous serial interfaces and synchronous serial interfaces are also DTE/DCE interfaces. -
Question 18 of 25
18. Question
1 pointsWhat are three components of PPP? (Choose three.)Correct
Incorrect
Hint
PPP is a WAN protocol to provide serial point-to-point connections. The three main components of HDLC include the Network Control Protocol (NCP), an extensible Link Control Protocol (LCP), and framing similar to HDLC. -
Question 19 of 25
19. Question
1 pointsA laptop is connected to an AP and is associated with the connection that is labeled A. The AP is connected to a switch and is associated with the connection that is labeled B. A PC is attached to the switch. The switch is connected to router RTA. The connection of the PC, through the switch, to RTA is associated with the connection that is labeled C. RTA is connected via a serial connection to the ISP and is associated with the connection labeled D.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 shutdownCorrect
Incorrect
Hint
HDLC is the default encapsulation method on Cisco router serial interfaces. If no other encapsulation is configured, the interface will default to HDLC. -
Question 20 of 25
20. Question
1 pointsWhich two statements describe a PPP connection between two Cisco routers? (Choose two.)Correct
Incorrect
Hint
PPP uses LCP to perform the functions of establishing, configuring, and testing the data-link connections on the link as well as negotiating encapsulation, authentication, and compression formats. -
Question 21 of 25
21. Question
1 pointsOpen 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?Correct
Incorrect
Hint
The hostname in one router must be the same as the username in the other router, unless a username is specified with the ppp pap sent-username interface command. -
Question 22 of 25
22. Question
1 pointsQuestion as presented:Sort elements
- The maximum size of the PPP frame
- The two choices are Password Authentication Protocol (PAP) ans Challenge Handshake Authentication Protocol (CHAP)
- Provides load balancing over the router interfaces
- Increases the effective throughput on PPP connection by reducing the amount of data in the frame that must travel across the link
- Helps to ensure a reliable, loop-free data link layer.
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Maximum Receive Unit
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Authentication Protocol
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Multilink
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Compression
Correct
Incorrect
Hint
Compression, Increases the effective throughput on PPP connections by reducing the amount of data in the frame that must travel across the link.; Multilink, Provides load balancing over the router interfaces. Maximum Recieve Unit, The maximum of the PPP frame. Not used, Helps to ensure a reliable loop-free data ink layer. Authentication Protocol, The two choices are Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP). -
Question 23 of 25
23. Question
1 pointsQuestion as presented:Sort elements
- establish the link and negotiate configuration options
- determine the quality of the link
- negotiate with the network layer to configure L3 protocol
- verify authentication between NCP and the network layer protocol
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phase 1
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phase 2
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phase 3
Correct
Incorrect
Hint
The first two steps happen at Layers 1 and 2. Once the link is established and configured, link quality can be determined before layer 3 configuration takes place. -
Question 24 of 25
24. Question
1 pointsQuestion as presented:Sort elements
- use LCP to negotiate the type of authentication
- calculate the ID and random number
- calculate the MD5 hash
- send the challenge ID, hash, and username
- calculate the hash based on received information
- compare the received hash with the calculate the hash
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Step 1
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Step 2
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Step 3
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Step 4
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Step 5
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Step 6
Correct
Incorrect
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Question 25 of 25
25. Question
1 pointsWhich is an advantage of using PPP on a serial link instead of HDLC?Correct
Incorrect
Hint
Authentication, multilink, and compression are options on PPP that are advantages over HDLC.
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