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- CCNA Routing and Switching 200-105
66.
Two routers have no initial configuration whatsoever. They are connected in a lab
using a DTE cable connected to R1 and a DCE cable connected to R2, with the DTE
and DCE cables then connected to each other. The engineer wants to create a working PPP link by configuring both routers. Which of the following commands are
required in the R1 configuration for the link to reach a state in which R1 can ping
R2’s serial IP address, assuming that the physical back-to-back link physically works?
(Choose two answers.)
- A.encapsulation ppp
- B.no encapsulation hdlc
- C.clock rate
- D.ip address
- Answer & Explanation
- Report
Answer : [A , D]
Explanation :
Explanation :
| Both routers need an encapsulation ppp command, and both also need IP addresses before the ping will work. R1 does not need a clock rate command because R2 is connected to the DCE cable. |
67.
Consider the following excerpt from the output of a show command:
Serial0/0/1 is up, line protocol is up Hardware is GT96K Serial Internet address is 192.168.2.1/24 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Open Open: CDPCP, IPCP, loopback not setWhich of the following are true about this router’s S0/0/1 interface? (Choose two answers.)
- A.The interface is using HDLC.
- B.The interface is using PPP.
- C.The interface currently cannot pass IPv4 traffic.
- D.The link should be able to pass PPP frames at the present time.
- Answer & Explanation
- Report
Answer : [B ,D]
Explanation :
Explanation :
| The output lists encapsulation PPP, meaning that it is configured to use PPP. The line and protocol status are both up, LCP is open, and both CDPCP and IPCP are open, meaning that IP and CDP packets can be sent over the link. |
68.
Two routers, R1 and R2, connect to each other using three serial links. The network
engineer configures these links to be part of the same multilink PPP group, along with
configuring CHAP configuration, IPv4, and OSPFv2 using interface configuration.
Which of the following answers list a configuration command along with the correct
configuration mode for that command? (Choose two answers.)
- A.encapsulation ppp while in multilink interface configuration mode
- B.ip address address mask while in serial interface configuration mode
- C.ppp authentication chap while in multilink interface configuration mode
- D.ip ospf 1 area 0 while in serial interface configuration mode
- D.ppp multilink while in serial interface configuration mode
- Answer & Explanation
- Report
Answer : [A , E]
Explanation :
Explanation :
| Both the multilink interface and each of the serial interfaces need the encapsulation ppp and ppp multilink commands, which account for both of the correct answers to this question. Two of the three incorrect answers list a command related to a Layer 3 feature (ip address and ip ospf), which are useful, but would be used in multilink interface mode instead of serial interface configuration mode. The other incorrect answer lists ppp authentication chap, which would not be used on the Layer 3 multilink interface, but instead on the serial interfaces. |
69.
Consider the following excerpt from the output of a show interfaces command on an
interface configured to use PPP:
Serial0/0/1 is up, line protocol is down Hardware is GT96K Serial Internet address is 192.168.2.1/24A ping of the IP address on the other end of the link fails. Which of the following are reasons for the failure, assuming that the problem listed in the answer is the only problem with the link? (Choose two answers.)
- A.The CSU/DSU connected to the other router is not powered on.
- B.The IP address on the router at the other end of the link is not in subnet 192.168.2.0/24.
- C.CHAP authentication failed.
- D.The router on the other end of the link has been configured to use HDLC.
- E.None of the above.
- Answer & Explanation
- Report
Answer : [C , D]
Explanation :
Explanation :
| The question states a problem symptom with an interface state of line status up, and protocol status down. One incorrect answer refers to a physical layer problem, which usually results in a line status (first status code) value of down. Another incorrect answer mentions an IP address mismatch on the ends of a link; this mistake allows both the line and protocol status of the interface to reach an up state. The two correct answers result in the router having a line status of up, but a protocol status of down. |
70.
Which of the following topology terms most closely describe the topology created
by a Metro Ethernet Tree (E-Tree) service? (Choose two answers.)
- A.Full mesh
- B.Partial mesh
- C.Hub and Spoke
- D.Point-to-point
- Answer & Explanation
- Report
Answer : [B and C]
Explanation :
Explanation :
|
A Metro Ethernet E-Tree service uses a rooted point-to-multipoint Ethernet
Virtual Connection (EVC), which means that one site connected to the service (the root)
can communicate directly with each of the remote (leaf) sites. However, the leaf sites
cannot send frames directly to each other; they can only send frames to the root site.
Topology design like this that allow some but not all pairs of devices in the group to
communicate is called a partial mesh, or hub and spoke, or in some cases a multipoint
or point-to-multipoint topology. Of the incorrect answers, the full mesh term refers to topology designs in which each pair in the group can send data directly to each other, which is typical of a MetroE E-LAN service. The term point-to-point refers to topologies with only two nodes in the design, and they can send directly to each other, typical of a MetroE E-Line service. |
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