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Deploying Cisco Service Provider Network Routing (SPROUTE)

Question No: 11

A Cisco IOS XR router is a member in OSPF 1 and EIGRP 100 domains, and needs to redistribute OSPF learned routes into EIGRP. Which configuration achieves this goal?

1. router eigrp 100 address-family ipv4 redistribute ospf 1

2. router eigrp 100

   redistribute ospf 1 route-policy OS_INTO_EIG

   route-policy OS_INTO_EIG set eigrp-metric 100 10 255 1 155

3. router eigrp 100 address-family ipv4

   redistribute ospf 1 route-policy OS_INTO_EIG

   route-policy OS_INTO_EIG set eigrp-metric 100 10 255 1 155

4. router eigrp 100

default-metric 100 1 255 1 1500

redistribute ospf 1

Answer: C

Question No: 12

Refer to the exhibit.

Which configuration is required on XR2 to enable MD5 IS-IS Authentication between R1 and XR2 using the password CISCO?

1. Router isis ABC

   interface GigabitEthernet0/0/0/0 hello-password encrypted CISCO

2. Router isis ABC

   interface GigabitEthernet0/0/0/0 hello-password hmac-md5 CISCO

3. Router isis ABC

   lsp-password hmac-md5 CISCO

4. Router isis ABC

lsp-password encrypted CISCO

Answer: B

Question No: 13

On the PE5 router, there are how many IPv4 and IPv6 OSPF neighbors and how many IPv4 OSPF interfaces? (Choose three)

1. Two ipv4 ospf neighbors

2. Three ipv4 ospf neighbors

3. Two ipv6 ospf neighbors

4. Three ipv6 ospf neighbors

5. Three ipv4 ospf interfaces

6. Four ipv4 ospf interfaces

Answer: A,E,F Explanation:

# show ip ospf neighbor

# show ipv6 ospf neighbor

Question No: 14

What is recursive lookup in BGP and how does it work?

1. The router looks up the EBGP route and the EBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the EBGP next hop using the IBGP.

2. The router looks up the IBGP route and the IBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the IBGP next hop using the EBGP.

3. The router looks up the BGP route and the BGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the BGP next hop using the IGP.

4. The router looks up the route and the next hop to reach a destination in the remote AS using the IGP. Then the router looks up the route to reach the next hop using BGP.

5. The router perform three routing lookups to determine the route to reach a destination in the remote AS. The first lookup is done using EBGP, the second lookup is done using IBGP, and the third lookup is done using the IGP.

Answer: C Explanation:

A few different approaches are available to deal with iBGP and synchronization. We may turn on the synchronization option on our routers and wait for the IGP to have a route for the destination before it’s advertised to peers. Another option is to simply use a full mesh, so that iBGP convergence isn’t an issue.

Clearly that isn’t going to happen when a network’s core needs to scale: it will implement something like reflectors that cause iBGP’s full mesh to be broken.

The real alternative, if you don’t enable synchronization, is to use route recursion. A recursive route lookup uses the BGP next-hop attribute to actually make a different route lookup. The IGP can use the destination network instead of the AS-path to determine where it gets sent. Even if the iBGP hasn’t converged, the routers will still know how to get

to that network, since it will exist in the router it was advertised from, who will know the next-hop.

Question No: 15 DRAG DROP

Answer:

Question No: 16

Which of the following is used by an IS-IS router to detect other IS-IS neighbor routers and

to form adjacencies?

1. ESH

2. ISH

3. IIH

4. PSNP

5. CSNP

Answer: C Explanation:

ISIS actually features three different hello types

An ES Hello (ESH) is send by all End Systems, and all IS devices listen for this Hello

An IS Hello (ISH) announces the presence of an IS – An IS Hello is sent by all IS devices, and End Systems listen for these hellos Finally, an IS-to-IS Hello (IIH) is used by an IS to discover other ISes and to form adjacencies with them A router will send an IIH to another router on the link to form or maintain an adjacency, but it will still send an ISH as well in case there are end systems located on that segment

Question No: 17

Which reserved AS number or range of numbers is used for backward compatibility between old BGP peers using 16-bit AS number and new BGP peers using 32-bit AS number?

A. AS 65001 to 65535

B. AS 65512 to 65535

C. AS 12345

D. AS 23456

E. AS 64001

Answer: D Explanation:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6554/ps6599/4byte_asnios. pdf

New Reserved AS# AS_TRANS = AS #23456

2-byte placeholder for a 4-byte AS number

Used for backward compatibility between OLD and NEW BGP speakers

Question No: 18

An engineer is using configuration blocks to build policy-based routing. All other traffic must not be affected and the policy must be applied to GigabitEthernet1/0. Which block correctly implements traffic that is destined for 10.10.10.0/24 using a next hop of 192.168.55.1?

1. access-list 110 permit ip any 10.10.10.0 0.0.0.255 route-map PBR permit 10

   match ip address 110

   set next-hop 192.168.55.1 interface GigabitEthernet1/0 ip policy route-map PBR

2. access-list 110 permit ip any 10.10.10.0 0.0.0.255 route-map PBR permit 10

match ip address 110

set next-hop 192.168.55.1 route-map PBR permit 20 interface GigabitEthernet1/0 ip policy route-map PBR

C. access-list 110 permit ip any 10.10.10.0 255.255.255.0 route-map PBR permit 10

match ip address 110

set next-hop 192.168.55.1 interface GigabitEthernet1/0 ip policy route-map PBR

D. access-list 110 permit ip any 10.10.10.0 255.255.255.0 route-map PBR permit 10

match ip address 110

set next-hop 192.168.55.1 route-map PBR permit 20 interface GigabitEthernet1/0 ip policy route-map PBR

Answer: B

Question No: 19

When monitoring the OSPF operations in the network, you notice that the OSPF process is not load balancing traffic across multiple OSPF links. Which configuration adjustment could be made to enable the OSPF process to load balance traffic across multiple OSPF links?

1. Enable BFD on the OSPF interfaces and on the OSPF routing process.

2. Enable NSR on the OSPF routing process.

3. Enable NSF on the OSPF routing process.

4. Adjust the OSPF cost on the OSPF interfaces.

5. Adjust the OSPF variance parameter.

6. Use the wide-style OSPF metric instead of the narrow-style OSPF metric.

Answer: D

Question No: 20

In Cisco IOS and Cisco IOS XE Software images, when redistributing routes from other routing protocols into OSPF, what is a common reason why some of the routes might not be redistributed into OSPF?

1. The OSPF external metric type (E1 or E2) is not defined.

2. The OSPF seed metric is not defined.

3. The OSPF level (Level 1, Level 2, or Level-1-2) to which the routes will be redistributed into is not defined.

4. The subnets option in the redistribute command is missing.

Answer: D

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