Question 1

The engineering team at ISP_1 must improve network stability time and minimize the impact of routing instabilities from other domains to unicast transit services in the backbone R1 is part of an OSPF- enabled network, and acts as an ASBR connected via interface GiO to the external domain The OSPF exponential backoff algorithm RFC 3623 with helper mode is already implemented on R1 Which additional configuration must the ISP_1 team apply to suppress routing instability for 3 minutes'?

Options :

A : Configure ip ospf resync-timtout 180 under the Gi0'1 interface configuration

B : Configure ip ospf timer nsf interval 3 under the global Gi0'1 interface configuration

C : Configure nsf ittf restart-inttrval 180 under the global OSPF configuration

D : Configure nsf ospf wait 3 under the global OSPF configuration

Answer: A

Question 2

Refer to the exhibit.

The four routers in this network have formed adjacencies. Router R2 is an IS-IS level 1-2 router that connects to other areas, and the attach bit is set in the R2 level 1 LSP advertisements to R1. According to the network design, R2 should push level 2 routes from its routing table to the R1 routing table. However, R1 installed a default route in its routing table. Which action resolves this problem?

Options :

A :

Use The is-type level-1-2 backdoor command lo unset the attach bit on R1 and use a prefix List to filter prefixes from R2

B : Set the attach bit on R1and use a prefix list to filter prefixes from R2.

C :

Use the is-type level-1-2 backdoor command to unset the attach bit on R2 and configure a distribute-list to redistribute prefixes to R1

D : Configure R2 as a level 1 router and use a prefix list to filter prefixes to R1.

Answer: C

Question 3

Refer to the exhibit.

R1 is directly connected to R2 and R3. R1 is in BGP AS 123, R2 is in BGP AS 2, and R3

is in BGP AS 3. Assume that there is no connectivity issue between R1, R2 and R1, R3. Which result between

BGP peers R1, R2 and R1, R3 is true?

Options :

A : The BGP session does not come up between R1 and R2 and between R1 and R3.

B : The BGP session comes up between R1 and R2 and between R1 and R3.

C : The BGP session comes up between R1 and R3, but not between R1 and R2.

D : The BGP session comes up between R1 and R2, but not between R1 and R3

Answer: B

Question 4

Refer to the exhibit.

A service provider technician is working on a multicast issue for a customer. While

checking the multicast table, the technician notices that no flags are present for the (1.1.1.1, 239.1.1.1) entry, yet flags are present for the (1.1.1.1, 232.1.1.1) entry.

Which factor might explain this issue?

Options :

A : Only the administratively scoped range is permitted

B : Only ASM is permitted

C : Only the default SSM range is permitted

D : Only GLOP is permitted

Answer: C

Question 5

After changing the IP address on an IOS XR router, an engineer cannot ping the new address Which step did the engineer forget to complete?

Options :

A : commit the configuration

B : roll back the configuration

C : save the running configuration

D : merge the configuration

Answer: A

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