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- CCNP Routing 300-101
41.
A network design shows that R1 has four possible paths from itself to the data center
subnets. Which of the following commands is most likely to show you all the
possible next-hop IP addresses for these four possible routes?
- A.show ip eigrp topology
- B.show ip eigrp topology all-links
- C.show ip route eigrp
- D.show ip route eigrp all-links
- E.show ip eigrp topology all-learned
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Of the five options, show ip route eigrp all-links and show ip eigrp topology alllearned are not valid commands. Both show ip eigrp topology and show ip route eigrp can show at most successor and feasible successor routes. However, show ip eigrp topology all-links shows also nonfeasible successor routes, making it more likely to show all possible neighbors. |
42.
Router R1 has been configured for EIGRP. The configuration also includes an ACL
with one line— access-list 1 permit 10.10.32.0 0.0.15.255 —and the EIGRP configuration
includes the distribute-list 1 in command. Which of the following routes
could not be displayed in the output of the show ip eigrp topology command as a
result? (Choose two.)
- A.10.10.32.0 /19
- B.10.10.44.0 /22
- C.10.10.40.96 /27
- D.10.10.48.0 /23
- E.10.10.60.0 /30
- Answer & Explanation
- Report
Answer : [D][E]
Explanation :
Explanation :
| The two listed commands correctly configure EIGRP route filtering such that prefixes matched by the ACL’s permit clause will be allowed. All other prefixes will be filtered because of the implied deny all at the end of the ACL. The ACL permits numbers in the range 10.10.32.0–10.10.47.255, which leaves 10.10.48.0 and 10.10.60.0 unmatched by the permit clause. |
43.
The command output that follows was gathered from Router R1. If correctly referenced
by an EIGRP distribution list that filters outbound Updates, which of the following
statements are true about the filtering of various prefixes by this prefix list?
(Choose three.)
R1# sh ip prefix-list ip prefix-list question: 3 entries seq 5 deny 10.1.2.0/24 ge 25 le 27 seq 15 deny 10.2.0.0/16 ge 30 le 30 seq 20 permit 0.0.0.0/0
- A.Prefix 10.1.2.0/24 will be filtered because of clause 5.
- B.Prefix 10.1.2.224/26 will be filtered because of clause 5
- C.Prefix 10.2.2.4/30 will be filtered because of clause 15.
- D.Prefix 10.0.0.0/8 will be permitted
- E.Prefix 0.0.0.0/0 will be permitted.
- Answer & Explanation
- Report
Answer : [B][C][E]
Explanation :
Explanation :
| Sequence number 5 matches prefixes 10.1.2.0–10.1.2.255, with prefix lengths between 25 and 27, and denies (filters) those prefixes. This results in answer A being incorrect, because the prefix length (/24) is not in the correct range. Clause 15 matches prefixes 10.2.0.0–10.2.255.255, with prefix length exactly 30, matching answer C. Clause 20 matches only prefix 0.0.0.0 with length /0, so only a default route would match this entry. As a result, 10.0.0.0/8 does not match any of the three clauses. |
44.
R1 has correctly configured EIGRP to filter routes using a route map named question.
The configuration that follows shows the entire route map and related configuration.
Which of the following is true regarding the filtering action on prefix
10.10.10.0/24 in this case?
route-map question deny 10 match ip address 1 route-map question permit 20 match ip address prefix-list fred ! access-list 1 deny 10.10.10.0 0.0.0.255 ip prefix-list fred permit 10.10.10.0/23 le 25
- A.It will be filtered because of the deny action in route map clause 10.
- B.It will be allowed because of the double negative (two deny references) in clause 10.
- C.It will be permitted because of matching clause 20’s reference to prefix-list fred
- D.It will be filtered because of matching the implied deny all route map clause at the end of the route map.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| When used for route filtering, the route map action ( permit or deny ) defines the filtering action, and any referenced match commands’ permit or deny action just defines whether the prefix is matched. By not matching ACL 1 with a permit action, EIGRP does not consider a match to have occurred with clause 10 , so it moves to clause 20 . The prefix list referenced in clause 20 has a permit action, matching prefixes 10.10.10.0–10.10.11.255, with prefix lengths from 23 to 25. Both criteria match the prefix in question, making answer C correct. |
45.
An engineer has typed four different single-line prefix lists in a word processor. The
four answers show the four different single-line prefix lists. The engineer then does a
copy/paste of the configuration into a router. Which of the lists could match a subnet
whose prefix length is 27? (Choose two.)
- A.ip prefix-list fred permit 10.0.0.0/24 ge 16 le 28
- B.ip prefix-list barney permit 10.0.0.0/24 le 28
- C.ip prefix-list wilma permit 10.0.0.0/24 ge 25
- D.ip prefix-list betty permit 10.0.0.0/24 ge 28
- Answer & Explanation
- Report
Answer : [B],[C]
Explanation :
Explanation :
| Answer A is invalid. The ge value must be larger than /24 in this case, so the command is rejected. Answer B implies a prefix length range of 24–28, inclusive. Answer C implies a range of 25–32 inclusive, because no le parameter exists to limit the prefix length lower than the full length of an IPv4 subnet mask. The same logic applies with answer D, but with a range of 28–32, so this final list could not match prefix lengths of /27. |
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