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When configuring IPv4 and IPv6 IS-IS routing on Cisco IOS XR routers, which three statements are correct? (Choose three.)
A. By default, a single SPF is used for both IPv4 and IPv6, so the IPv4 and IPv6 topology should be the same.
B. By default, the IS-IS router type is Level 1 and Level 2.
C. All IS-IS routers within the same IS-IS area must be configured with the same IS-IS routing process instance ID.
D. By default, metric-style narrow is used.
E. By default, the IS-IS interface circuit type is Level 1 and Level 2.
F. The area IS-IS address-family configuration command is used to specify the IS-IS area address.
Correct Answer: BDE
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? (Choose two.)
A. The configuration is missing the interface gi0/0 and interface gi0/0 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 and gi0/1 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.
Correct Answer: CD
What are two purposes of the BGP scan-time command? 642-883 dumps (Choose two.)
A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops
B. to allow faster detection of downed BGP peers
C. to improve BGP convergence time
D. to tune the BGP update interval
E. to decrease the effects of unstable routes by increasing the route suppression time
Correct Answer: AC
Refer to the network diagram in the exhibit.
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?
Correct Answer: A
Refer to the BGP and route map configurations exhibit.
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 BGP session was cleared using the clear ip bgp command after the route map was applied.
B. The test1 or test2 prefix-list is misconfigured.
C. There is no pass action configured within the route map.
D. The route map is missing the route-map setas permit 30 statement.
Correct Answer: D
Refer to the Cisco IOS route map configuration exhibit.
Which two statements are correct? 642-883 dumps (Choose two.)
A. The match prefix-list condition is a logical OR: match prefix list PL1 OR PL2.
B. All match conditions are logical OR: match prefix list PL1 OR PL2 OR match the APACL1 AS path
C. The three match conditions are logical AND. match prefix list PL1 AND PL2 AND match the APACL1
AS path access list.
D. The local preference AND the metric will be set to 100 IF the route matches the PL1 OR PL2 prefix list
AND the route must also match the APACL1 AS path access list.
E. All routes that are not matched by the sequence 10 route map statement will be dropped.
Correct Answer: AD
What is the default OSPF seed metric and type?
A. 10 and E1
B. 10 and E2
C. 20 and E1
D. 20 and E2
E. 0 and E1
F. 0 and E2
Correct Answer: D
Which high-availability mechanism is a detection protocol that is enabled at the interface and at the routing
Correct Answer: D
Routes that are received from an IBGP peer will be propagated to which other routers by default?
A. to the EBGP peers only
B. to the IBGP peers only
C. to both EBGP and IBGP peers
D. to no other peers
Correct Answer: A
Refer to the show command output in the exhibit.
For which reason will this router drop all traffic that is destined to the 22.214.171.124/24 network?
A. The 126.96.36.199/24 route is not synchronized.
B. The BGP next hop for reaching the 188.8.131.52/24 network is not reachable.
C. The metric of the 184.108.40.206/24 route is set to 0.
D. The weight of the 220.127.116.11/24 route is set to 0.
E. The 18.104.22.168/24 route is an incomplete route.
F. The IBGP split-horizon rule is preventing the router to use the IBGP route.
Correct Answer: B
Which two features are specific only to Tier 3 providers? (Choose two.)
A. interconnects with Tier Level 1 and Tier Level 2 ISPs in public peering points
B. only purchases transit from other networks to reach the Internet
C. purchases transit and pays settlements to other service providers
D. uses strict route filtering to allow only customer and local routes to be sent to upstream providers
E. receives a full Internet routing table via BGP from its upstream provider, which it can use for loadbalancing traffic
Correct Answer: BD
Which two statements about a transit AS are correct? 642-883 dumps (Choose two.)
A. A transit AS has eBGP connection(s) to only one external AS.
B. Routes between ASs are always exchanged via eBGP.
C. A transit AS uses an IGP like OSPF or ISIS to propagate the external networks within the transit AS.
D. Core routers within a transit AS normally use default routing to reach the external networks.
E. iBGP sessions can be established between non directly connected routers.
Correct Answer: BE
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