Exam 300-410 topic 1 question 611 discussion

Actual exam question from Cisco's 300-410

Question #: 611
Topic #: 1

Refer to the exhibit. R1 is multihomed to ISP1 and ISP2. uRPF strict mode has been configured on both interfaces uplinked to the ISPs. Traffic destined to the Internet over ISP1 returns to R1 via ISP2 and is immediately dropped.

Which configuration changes address this issue and allow return traffic from the other ISP?

A. R1(config)#interface fastethernet 0/1
R1(config-if)# ip verify unicast source reachable-via any
B. R1(config)#interface fastethernet 0/1
R1(config-if)# ip verify unicast source reachable-via any allow-default
C. R1(config)#interface fastethernet 0/0
R1(config-if)# no ip verify unicast source reachable-via any allow-default
D. R1(config)#interface fastethernet 0/0
R1 (config-if)# ip verify unicast source reachable-via rx

Show Suggested Answer

Suggested Answer: B 🗳️

by krobo at July 2, 2024, 7:46 p.m.

Comments

Submit Cancel

IntangibleW

5 months ago

Selected Answer: B

Probably R1 uses default route to reach the Internet traffic source, so B

upvoted 2 times

...

0d2257b

6 months, 3 weeks ago

Selected Answer: B

I go with B because this is an ISP link and the router is multi-homed. Both links are connected to the internet

upvoted 2 times

...

Cpt_Krugel

8 months ago

Selected Answer: B

I agree B lines up more with the question

upvoted 1 times

...

tubirubs

9 months, 2 weeks ago

Selected Answer: B

allow-default is configured when the return of traffic is over on default route, I supose that ISP1 and ISP2 delivery both default route to client, not Full Route. So, B is correct.

upvoted 4 times

...