- Home
- Networking
- CCNP Routing 300-101
36.
The output of show ip eigrp topology on Router R1 shows the following output,
which is all the output related to subnet 10.11.1.0/24. How many feasible successor
routes does R1 have for 10.11.1.0/24?
P 10.11.1.0/24, 2 successors, FD is 2172419 via 10.1.1.2 (2172423/28167), Serial0/0/0.1 via 10.1.1.6 (2172423/28167), Serial0/0/0.2
- A.0
- B.1
- C.2
- D.3
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| This command lists all successor and feasible successor routes. The output states that two successors exist, and only two routes (listed with the “via...” text) exist. So, no feasible successor routes exist. |
37.
A network design shows that R1 has four different possible paths from itself to the
data center subnets. Which of the following can influence which of those routes
become feasible successor routes, assuming that you follow the Cisco-recommended
practice of not changing metric weights? (Choose two.)
- A.The configuration of EIGRP offset lists
- B.Current link loads
- C.Changing interface delay settings
- D.Configuration of variance
- Answer & Explanation
- Report
Answer : [A][C]
Explanation :
Explanation :
| By default, the metric weights cause EIGRP to consider bandwidth and delay in the metric calculation, so changing either bandwidth or delay impacts the calculation of the feasible distance and reported distance, and impacts the choice of feasible successor routes. Offset lists also change the metric, which in turn can change whether a route is an FS route. Link loading would impact the metrics, but not without changing the metric weights to nonrecommended values. Finally, variance impacts which routes end up in the IP routing table, but it is not considered by EIGRP when determining which routes are FS routes. |
38.
Router R1 is three router hops away from subnet 10.1.1.0/24. According to various
show interfaces commands, all three links between R1 and 10.1.1.0/24 use the following
settings: bandwidth (in kbps): 1000, 500, 100000 and delay (in microseconds):
12000, 8000, 100. Which of the following answers correctly identify a value
that feeds into the EIGRP metric calculation? (Choose two.)
- A.Bandwidth of 101,500 kilobits per second
- B.Bandwidth of about 34,000 kilobits per second
- C.Bandwidth of 500 kilobits per second
- D.Delay of 1200 tens-of-microseconds
- E.Delay of 2010 tens-of-microseconds
- F.Delay of 20100 tens microseconds
- Answer & Explanation
- Report
Answer : [C][E]
Explanation :
Explanation :
| The EIGRP metric calculation treats bandwidth and delay differently. For bandwidth, EIGRP takes the lowest bandwidth, in kbps, which is in this case 500 kbps. For delay, EIGRP takes the cumulative delay, which is 20100 per the various show interfaces commands. However, the show interfaces command uses a unit of microseconds, and the interface delay command and the EIGRP metric formula use a unit of tens-of-microseconds, making the delay that feeds into the formula be 2010. |
39.
Routers R1 and R2 are EIGRP neighbors. R1 has been configured with the eigrp stub
connected command. Which of the following are true as a result? (Choose two.)
- A.R1 can learn EIGRP routes from R2, but R2 cannot learn EIGRP routes from R1.
- B.R1 can send IP packets to R2, but R2 cannot send IP packets to R1.
- C.R2 no longer learns EIGRP routes from R1 for routes not connected to R1.
- D.R1 no longer replies to R2’s Query messages
- E.R2 no longer sends Query messages to R1.
- Answer & Explanation
- Report
Answer : [C][E]
Explanation :
Explanation :
| R1, as a stub router with the connected option, still advertises routes, but only routes for connected subnets. R1 announces its stub attribute to R2, so R2 chooses to not send Query messages to R1, knowing that R1 cannot be a transit router for other subnets anyway. |
40.
Router R1 lists four routes for subnet 10.1.1.0/24 in the output of the show ip eigrp
topology all-links command. The variance 100 command is configured, but no
other related commands are configured. Which of the following rules is true regarding
R1’s decision of what routes to add to the IP routing table? Note that RD refers
to reported distance and FD to feasible distance.
- A.Adds all routes for which the metric is <= 100 * the best metric among all routes
- B.Adds all routes because of the ridiculously high variance setting
- C.Adds all successor and feasible successor routes
- D.Adds all successor and feasible successor routes for which the metric is <= 100 * the best metric among all routes
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| EIGRP considers only successor and feasible successor routes. Each of those routes must have metrics such that variance * metric is less than the best route’s metric; the best route’s metric is called the feasible distance (FD). |
|
|
||||||||||||||||||||||||||||
