Which three statements are true regarding the OSPF router ID?
A. The OSPF routing process chooses a router ID for itself when it starts up.
B. The router-id command is the preferred procedure to set the router ID.
C. If a loopback interface is configured, its address will always be preferred as the router ID over any other methods.
D. After the router ID is set, it does not change, even if the interface that the router is using for the router ID goes down. The router ID changes only if the router reloads or if the OSPF routing process restarts.
E. In OSPF version 3, the OSPF router ID uses a 128-bit number.
Which four statements are correct regarding IS-IS operations?
A. By default, Level 1 routers within an IS-IS area do not carry any routing information external to the area to which they belong. They use a default route to exit the area.
B. Summarization should be configured on the Level 2 routers, which injects the Level 2 routes into Level 1.
C. IS-IS supports "route leaking" in which selected Level 2 routes can be advertised by a Level 1/Level 2 router into Level 1.
D. The IS-IS backbone is a contiguous collection of Level 1 capable routers, each of which can be in a different area.
E. With IS-IS, an individual router is in only one area, and the border between areas is on the link that connects two routers that are in different areas.
F. Cisco IOS XR Software supports multitopology for IPv6 IS-IS unless single topology is explicitly configured in IPv6 address-family configuration mode.
Refer to the PE1 router routing table output exhibit. What is causing the i su 10.1.10.0/24 [115/30] via 0.0.0.0, 00:40:34, Null0 entry on the PE1 router routing table?
RP/0/RSP0/CPU0:PE1#show route ipv4 isis
<output omitted> i su 10.1.10.0/24 [115/30] via 0.0.0.0, 00:40:34, Null0 i L1 10.1.10.1/32 [115/30] via 192.168.101.11, 00:42:39, GigabitEthernet0/0/0/0 i L1 10.1.10.2/32 [115/24] via 192.168.112.21, 00:44:40, GigabitEthernet0/0/0/1 i L1 10.1.10.3/32 [115/32] via 192.168.113.22, 00:38:23, GigabitEthernet0/0/0/2 i L1 10.1.10.4/32 [115/22] via 192.168.114.23, 00:14:10, GigabitEthernet0/0/0/3 <output omitted>
A. The PE1 router is receiving the 10.1.10.0/24 summary route from the upstream L1/L2 IS-IS router.
B. The PE1 router has been configured to summarize the 10.1.10.x/32 IS-IS routes to 10.1.10.0/24.
C. The 10.1.10.0/24 has been suppressed because IS-IS auto-summary has been disabled on the PE1 router.
D. The 10.1.10.0/24 has been suppressed because of a route policy configuration on the PE1 router.
E. The 10.1.10.0/24 has been suppressed because the more specific 10.1.10.x/32 IS-IS routes have been configured to leak into the IS-IS non-backbone area.
Refer to the Cisco IOS XE IS-IS configuration exhibit. What are two problems with the configuration that are causing the IPv4, or the IPv6, or the IPv4 and IPv6 IS-IS operations to fail?
interface GigabitEthernet0/0/0 ip address 192.168.104.40 255.255.255.0 ip router isis ipv6 address 2001:DB8:192:168:104::40/80 ipv6 enable ipv6 router isis ! interface GigabitEthernet0/0/1 ip address 192.168.134.40 255.255.255.0 ip router isis ipv6 address 2001:DB8:192:168:134::40/80 ipv6 enable ipv6 router isis ! router isis 1 net 49.0004.0100.0400.1001.00 summary-address 10.4.10.0 255.255.255.0 !
A. The configuration is missing the interface gi0/0/0 and interface gi0/0/1 commands under router isis 1.
B. The configuration is missing the address-family ipv4 unicast and address-family ipv6 unicast commands under router isis 1.
C. IPv6 unicast routing has not been enabled globally on the Cisco IOS XE router.
D. The gi0/0/0 and gi0/0/1 interfaces are not participating in the router isis 1 routing instance.
E. Multitopology IS-IS must be enabled to support both IPv4 and IPv6.
F. Another router isis instance must be enabled to support IPv6.
Refer to the IS-IS configuration exhibit. This is the typical IS-IS configuration of the routers in an AS using IS-IS as the IGP. This AS is in the transition phase of integrating IPv6 into the network. During this transition phase, some of the routers within the AS might be running IPv4 only, some might be running IPv6 only, and others might be running both IPv4 and IPv6. To avoid any black holes for the IPv6 traffic, which configuration change can be made?
When using the show bgp ipv6 unicast summary command to verify the IPv6 BGP session status with the IPv6 BGP peers, you noticed the "St/PfxRcd" status for one of the IPv6 BGP peers is in the "Active" state. What does the "Active" state indicate?
A. The IPv6 BGP session has been established with the IPv6 BGP peer.
B. The router is in the process of sending BGP routing updates to the IPv6 BGP peer.
C. The router is in the process of establishing the IPv6 BGP session with the IPv6 BGP peer.
D. The router is exchanging BGP notification messages with its IPv6 BGP peer.
Which AS path access list is used by a multihomed customer to only announce their own address space to their service providers to prevent the multihomed customer from becoming a transit AS?
A. ip as-path access-list permit local-as ip as-path access-list deny *
B. ip as-path access-list deny.* ip as-path access-list permit *
What is recursive lookup in BGP and how does it work?
A. 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.
B. 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.
C. 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.
D. 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.
E. 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.
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?
Which of the following is a characteristic of dual-multihomed connectivity between an enterprise network and the service provider network or networks?
A. An enterprise network announces a default route to each service provider.
B. Each service provider announces a default route on each of the links that connect to the customer with a different metric.
C. An enterprise network that is connected to two or more different service providers with two or more links per service provider and using BGP to exchange routing updates with the service providers.
D. Load balancing can be achieved using the maximum-paths command.
When trying to commit this configuration, the following error is displayed: % Failed to commit one or more configuration items during a pseudo-atomic operation. All changes made have been reverted. Please issue 'show configuration failed' from this session to view the errors. What is wrong with the configuration?
A. The update-source loopback 0 commands must be configured under the respective neighbor address-family.
B. The configuration is missing the required network command.
C. IPv6 unicast routing has not been enabled globally using the ipv6 unicast-routing command.
D. The configuration is missing the address-family ipv4 unicast and address-family ipv6 unicast commands under router bgp 65111.
route-policy setcomm if community matches-any (11:11, 44:44) then set community (55:55) additive elseif community matches-any (22:22) then set community (77:77) additive endif
Which statement correctly describes this route policy?
A. If a route has both the 11:11 and 22:22 communities (or 44:44 and 22:22), the router adds the 55:55 community only.
B. The pass action is required after each of the set community statements to make this route policy functional.
C. If a route only has the 22:22 community, then no community will be added by the router.
D. If a route only has the 11:11 or 44:44 community, then no community will be added by the router.
E. If a route contains the 11:11 or 44:44 community, the router adds the 55:55 community and continues. Additionally, if the same route also contains the 22:22 community, the router also adds another 77:77 community to the same route.
Refer to the BGP and route map configurations exhibit.
router bgp 65001 neighbor 10.1.1.2 remote-as 65023 neighbor 10.1.1.2 route-map setas out ! route-map setas permit 10 match ip address test1 set as-path prepend 65111 65112 ! route-map setas permit 20 match ip address test2 set as-path prepend 65202 65203 65204 ! !end of the route-map configuration
When the "setas" route map is applied to the 10.1.1.2 neighbor, the 10.1.1.2 neighbor is not able to receive all the required BGP routes from this router. What could be the problem?
A. The test1 or test2 prefix-list is misconfigured.
B. The BGP session was cleared using the clear ip bgp command after the route map was applied.
C. The route map is missing the route-map setas permit 30 statement.
D. There is no pass action configured within the route map.
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?
A. The OSPF seed metric is not defined.
B. The subnets option in the redistribute command is missing.
C. The OSPF level (Level 1, Level 2, or Level-1-2) to which the routes will be redistributed into is not defined.
D. The OSPF external metric type (E1 or E2) is not defined.
route-policy OSPFintoISIS if tag eq xxx then drop else set tag yyy endif end-policy
Based on the Cisco IOS XR route policy configuration, when redistributing OSPF routes into IS-IS, to which of the following does the "tag" value correspond?
A. The tag value represents the OSPF metric.
B. The tag value represents the administrative distance
C. The tag value identifies a route or set of routes.
D. The tag value is used to match whether the IS-IS route is an external or internal IS-IS route.
Refer to the Cisco IOS route map configuration exhibit.
route-map test permit 10 match ip address prefix-list PL1 PL2 match as-path APACL1 set local-preference 200 set metric 1000 ! route-map test permit 100
Which two statements are correct?
A. All routes that are not matched by the sequence 10 route map statement will be dropped.
B. The match prefix-list condition is a logical OR: match prefix list PL1 OR PL2.
C. All match conditions are logical OR: match prefix list PL1 OR PL2 OR match the APACL1 AS path access list.
D. The local preference AND the metric will be set to 1000 IF the route matches the PL1 OR PL2 prefix list AND the route must also match the APACL1 AS path access list.
E. The three match conditions are logical AND: match prefix list PL1 AND PL2 AND match the APACL1 AS path access list.
route-policy one end-policy ! route-policy two pass end-policy ! route-policy three drop end-policy ! route-policy four set weight 100 end-policy ! route-policy five pass drop pass end-policy
Which five route policies will cause the routes to be dropped or passed?
A. route-policy four will cause the routes to be dropped.
B. route-policy five will cause the routes to be dropped.
C. route-policy five will cause the routes to be passed.
D. route-policy three will cause the routes to be dropped.
E. route-policy one will cause the routes to be dropped.
F. route-policy one will cause the routes to be passed.
G. route-policy two will cause the routes to be dropped.
H. route-policy two will cause the routes to be passed.
I. route-policy four will cause the routes to be passed.
J. route-policy three will cause the routes to be passed.
route-policy SetLP if med eq 10 then set local-preference 200 endif if local-preference eq 100 then set weight 100 endif if local-preference eq 200 then set weight 200 endif end-policy
If the original incoming routing update has a MED of 10 and a local preference of 100, how will the routing update be modified?
A. The local preference will be set to 100, the MED will be set to 10, and the weight will be set to 200.
B. The local preference will be set to 200, the MED will be set to 10, and the weight will be set to 100.
C. The local preference will be set to 100, the MED will be set to 10, and the weight will be set to 100.
D. The local preference will be set to 200, the MED will be set to 10, and the weight will be set to 200.
Refer to the topology diagram in the exhibit. Which IS-IS feature could be implemented so that the return path for the packets from router Y in area 49.00AA to router X in area 49.00BB will use the more optimal path?
A. Change the area 49.00AA type from a stub area to a regular area.
B. Enable route leaking to pass Level 2 information into the Level 1 routers.
C. Change the IS-IS administrative distance on router Y in area 49.00AA.
D. Change the IS-IS metric type from narrow to wide on all IS-IS routers.
Assuming the IBGP session within AS 64500 was established using the loopback 0 interface between the two routers, by default, what will be the next hop of the routes from AS 64501 when the routes appear on the router running IBGP only in AS 64500?
route-policy new if community matches-any test then set local-preference 10 elseif community matches-every foo then set local-preference 20 else pass endif end-policy
Which two statement are correct?
A. The "match-any" option indicates matching either the standard community or extended community.
B. "test" and "foo" are references to the community sets.
C. Routes that match both the "test" and "foo" conditions will have their local preference set to 20.
When redistributing routes into OSPF, which kind of routes will be redistributed by default on Cisco IOS XR Software but will not be automatically redistributed by default on Cisco IOS Software and Cisco IOS XE Software?
Refer to the exhibit. Which Cisco IOS XR configuration is missing to complete the configuration task of enabling BFD with only the OSPF peer over the gi0/3/0/1 interface in area 0?
router ospf 100 bfd minimum-interval 2 bfd multiplier 20 area 0 interface GigabitEthernet0/3/0/1 interface GigabitEthernet0/3/0/2 end
A. bfd fast-detect also needs to be enabled for the OSPF area under area 0. RP/0/RSP0/CPU0:P1(config-ospf-ar)#bfd fast-detect
B. bfd fast-detect also needs to be enabled globally on the router. RP/0/RSP0/CPU0:P1(config)#bfd fast-detect
C. bfd fast-detect also needs to be enabled globally under router ospf 100. RP/0/RSP0/CPU0:P1(config-ospf)#bfd fast-detect
D. bfd fast-detect also needs to be enabled on the gi0/3/0/1 interface under interface gi0/3/0/1. RP/0/RSP0/CPU0:P1(config-if)#bfd fast-detect
E. bfd fast-detect also needs to be enabled for the OSPF interface under area 0 interface gi0/3/0/1. RP/0/RSP0/CPU0:P1(config-ospf-ar-if)#bfd fast-detect
Refer to the Cisco IOS show command output shown in the exhibit.
R1# show ip bgp 10.2.10.1 BGP routing table entry for 10.2.10.1/32, version 32 Paths: (2 available, best #2, table default) Advertised to update-groups: 2 64500 64500 64502 192.168.103.30 from 192.168.103.30 (10.3.1.1) Origin IGP, localpref 100, weight 100, valid, external 64500 64500 64502 192.168.134.40 (metric 11) from 192.168.134.40 (10.4.1.1) Origin IGP, localpref 100, weight 200, valid, external, best
R1# show ip bgp BGP table version is 89, local router ID is 11.0.0.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 10.2.10.1/32 192.168.201.20 200 64500 64500 64500 64500 64502 i 192.168.101.10 100 64500 64500 64502 i
Which of the following statement is correct?
A. The best path to 10.2.10.1/32 was chosen because of the route origin.
B. The best path to 10.2.10.1/32 was chosen because of the weight.
C. The best path to 10.2.10.1/32 was chosen because of the AS path.
D. The best path to 10.2.10.1/32 was chosen because of the local preference.
E. The best path to 10.2.10.1/32 was chosen because of the MED.