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Exam 350-501 topic 1 question 151 discussion

Actual exam question from Cisco's 350-501
Question #: 151
Topic #: 1
[All 350-501 Questions]


Refer to the exhibit. Router 1 and router 2 are running OSPF Area 0. The router logs on both routers show that the LDP link has flapped. Which configuration must the engineer apply to the two routers to implement session protection on the link?

  • A. Router 1(config)# ip cef distributed Router 1(config)# mpls ldp session protection global Router 2(config)# ip cef distributed Router 2(config)# mpls ldp session protection global
  • B. Router 1(config)# ip cef distributed Router 1(config)# interface gigabitethernet 0/0 Router 1(config-if)# ip address 192.168.1.1 255.255.255.0 Router 1(config)# mpls ldp session protection Router 2(config)# interface gigabitethernet 0/0 Router 2(config-if)# ip address 192.168.1.2 255.255.255.0 Router 2(config)# mpls ldp session protection
  • C. Router 1(config)# ip cef distributed Router 1(config)# interface gigabitethernet 0/0 Router 1(config-if)# ip address 192.168.1.1 255.255.255.255 Router 1(config-if)# exit Router 1(config)# mpls ldp session protection Router 2(config)# ip cef distributed Router 2(config)# interface gigabitethernet 0/0 Router 2(config-if)# ip address 192.168.1.2 255.255.255.255 Router 2(config-if)# exit Router 2(config)# mpls ldp session protection
  • D. Router 1(config)# ip cef distributed Router 1(config)# interface gigabitethernet 0/0 Router 1(config-if)# ip address 192.168.1.1 255.255.255.0 Router 1(config-if)# mpls label protocol ldp Router 1(config-if)# mpls ip Router 1(config-if)# exit Router 1(config)# mpls ldp session protection Router 2(config)# ip cef distributed Router 2(config)# interface gigabitethernet 0/0 Router 2(config-if)# ip address 192.168.1.2 255.255.255.0 Router 2(config-if)# mpls label protocol ldp Router 2(config-if)# mpls ip Router 2(config-if)# exit Router 2(config)# mpls ldp session protection
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Suggested Answer: D 🗳️

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EdgardoAC
Highly Voted 3 years, 4 months ago
Selected Answer: D
By process of elimination, I labbed the commands. A: global keyword is not part of the command, mpls ldp session protection B: mpls ldp session proteccion command can't be entered in the interface configuration C: easiest elimination, bad subnet masks D: Correct answer
upvoted 8 times
chst
2 years, 1 month ago
In B the session protect is configured under global (config)# --> (config)# mpls ldp session protection I think Jmbp12 is right
upvoted 2 times
thejag
1 year, 11 months ago
On B it is missing ip cef distributed on R2 but it is needed on both routers. I think D is the perfect and full configuration necessary.
upvoted 1 times
thejag
1 year, 10 months ago
B is missing CEF on R2 so cannot be B
upvoted 1 times
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rans3001
Most Recent 10 months, 1 week ago
A not ok because global keyword does not exist C not ok because the subnet masks are wrong B Looks almost ok, but exit from the interfaces is missing D. Looks ok
upvoted 1 times
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sushil_bhattacharjee
1 year, 2 months ago
Selected Answer: D
Can we configure "mpls label protocol ldp" on an interface, The answer is yes; it is possible to configure under the interface or global configuration mode.
upvoted 1 times
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Martiian
1 year, 4 months ago
Honestly such a dumb question... how can you have 2 answers to close to each other.. I mean both B and D will get the job done. I guess D is more complete.
upvoted 1 times
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HARDCCNP
1 year, 7 months ago
Selected Answer: B
The correct answer is B. The ldp command is running in global configuration mode. In answer D, it shows the ldp protocol command within the interface. This command is done in global mode to enable ldp as preferable to tdp.
upvoted 1 times
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Seele
1 year, 9 months ago
Router 1(config)# ip cef distributed Router 1(config)# interface gigabitethernet 0/0 Router 1(config-if)# ip address 192.168.1.1 255.255.255.0 Router 1(config-if)# mpls label protocol ldp Router 1(config-if)# mpls ip Router 1(config-if)# exit Router 1(config)# mpls ldp session protection Router 2(config)# ip cef distributed Router 2(config)# interface gigabitethernet 0/0 Router 2(config-if)# ip address 192.168.1.2 255.255.255.0 Router 2(config-if)# mpls label protocol ldp Router 2(config-if)# mpls ip Router 2(config-if)# exit Router 2(config)# mpls ldp session protection D is correct
upvoted 2 times
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Totalstranger
2 years ago
Selected Answer: B
it would be B, LDP flapped, meaning it was configured already
upvoted 2 times
thejag
1 year, 11 months ago
But the IP address was also there before so why put that again and in B the ip cef distributed is MISSING on R2 where it is needed. D is correct configuration
upvoted 1 times
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thejag
2 years, 3 months ago
Answer is D The mpls ldp session protection is entered from the global config mode so you have to exit from the interface mode. This is how Cisco have documented it: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/15-s/mp-ldp-15-s-book/mp-ldp-sessn-prot.html
upvoted 1 times
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jmbp12
3 years, 2 months ago
The answer is B. The mpls ldp session protection command was not applied to the interface, it was applied in global config mode. Te questions says LDP flapped meaning LDP was previously configured so why should we enable MPLS again on the interfaces? For me the answer should be B.
upvoted 4 times
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KING_II
3 years, 5 months ago
C is the most correct, because it exit out of interface config mode before apply ldp session protection on global.
upvoted 1 times
NetworkYoda72
2 years, 7 months ago
Subnet mask on C is incorrect (/32). Answer is D.
upvoted 1 times
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Cprest
3 years, 5 months ago
Totally agree, the answer correct is D
upvoted 1 times
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jefranca
3 years, 6 months ago
The better is D A is wrong, coz there's no "global" in the "mpls ldp session protection" command. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/xe-16-5/mp-ldp-xe-16-5-book/mp-ldp-sessn-prot.html
upvoted 3 times
EdgardoAC
3 years, 4 months ago
Correct, the global keyword it not in that command so A is discarded, D is the better answer.
upvoted 1 times
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B (20%)
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