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31.
An engineer has added the following configuration snippet to an implementation
planning document. The configuration will be added to Router R1, whose Fa0/0
interface connects to a LAN to which Routers R2 and R3 also connect. R2 and R3
are already EIGRP neighbors with each other. Assuming that the snippet shows all
commands on R1 related to EIGRP authentication, which answer lists an appropriate
comment to be made during the implementation plan peer review?
key chain fred key 3 key-string whehew interface fa0/0 ip authentication key-chain eigrp 9 fred
- A.The configuration is missing one authentication-related configuration command.
- B.The configuration is missing two authentication-related configuration commands.
- C.Authentication type 9 is not supported; type 5 should be used instead
- D.The key numbers must begin with key 1, so change the key 3 command to key 1.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The configuration requires the ip authentication mode eigrp asn md5 command, which is currently missing. This command enables MD5-style authentication, rather than the default of no authentication. Adding this one command completes the configuration. Any valid key numbers can be used. Also, the 9 in the ip authentication key-chain eigrp 9 fred command refers to the EIGRP ASN, not an authentication type. |
32.
A company has a Frame Relay WAN with one central-site router and 100 branch
office routers. A partial mesh of PVCs exists: one PVC between the central site and
each of the 100 branch routers. Which of the following could be true about the
number of EIGRP neighborships?
- A.A partial mesh totaling 100: one between the central-site router and each of the 100 branches.
- B.A full mesh — (101 * 100) / 2 = 5050 — One neighborship between each pair of routers.
- C.101 — One between each router (including the central site) and its nearby PE router.
- D.None of the answers is correct.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| EIGRP forms neighborships only when two routers can communicate directly over a data link. As a result, with Frame Relay, EIGRP neighborships occur only between routers on the ends of a PVC, so in this case, 100 neighborships exist. |
33.
Which of the following are methods that EIGRP uses to initially populate (seed) its
EIGRP topology table, before learning topology data from neighbors? (Choose two.)
- A.By adding all subnets listed by the show ip route connected command
- B.By adding the subnets of working interfaces over which static neighbors have been defined
- C.By adding subnets redistributed on the local router from another routing source
- D.By adding all subnets listed by the show ip route static command
- Answer & Explanation
- Report
Answer : [B],[C]
Explanation :
Explanation :
| Other than the two listed correct answers, the local router also adds connected routes for which the network command matches the corresponding interfaces, so it might not add all connected routes. Also, EIGRP does not add static routes to the EIGRP topology table, unless those routes are redistributed. |
34.
Which of the following are both advertised by EIGRP in the Update message and
included in the formula for calculating the integer EIGRP metric? (Choose two.)
- A.Jitter
- B.Delay
- C.MTU
- D.Reliablility
- Answer & Explanation
- Report
Answer : [B][D]
Explanation :
Explanation :
| EIGRP sends bandwidth, delay, reliability, load, MTU, and hop count in the message. The formula to calculate the metric includes bandwidth, delay, reliability, and load. |
35.
Router R1 uses S0/0 to connect through a T/1 to the Frame Relay service. Five PVCs
terminate on the serial link. Three PVCs (101, 102, and 103) are configured on subinterface
S0/0.1, and one each (104 and 105) are on S0/0.2 and S0/0.3. The configuration
shows no configuration related to EIGRP WAN bandwidth control, and the bandwidth
command is not configured. Which of the following is true about how Cisco
IOS tries to limit EIGRP’s use of bandwidth on S0/0?
- A.R1 limits EIGRP to around 250 kbps on DLCI 102.
- B.R1 limits EIGRP to around 250 kbps on DLCI 104.
- C.R1 limits EIGRP to around 150 kbps on every DLCI.
- D.R1 does not limit EIGRP because no WAN bandwidth control has been configured
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| EIGRP performs WAN bandwidth control without any explicit configuration, using default settings. Because no bandwidth commands have been configured, each subinterface uses the default 1544-kbps setting. For S0/0.1, WAN bandwidth control divides the 1544 by 3 (515 kbps) and then takes the (default) WAN bandwidth of 50 percent, meaning about 250 kbps for each of the three DLCIs. For the two subinterfaces with one PVC, the default 1544 is multiplied by the 50 percent default WAN bandwidth, meaning that each could use about 750 kbps. |
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