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QUESTION 1
Which two statements about a transit AS are correct? (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
QUESTION 2
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.
Correct Answer: C
QUESTION 3
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
QUESTION 4
In which network environment is IS-IS adjacency check important? 642-883 dumps
A. in a multitopology environment where there are different instances of IS-IS running on the same router
B. in an IPv4/IPv6 environment and running single-topology IS-IS
C. when a level L1/L2 IS-IS router is neighboring with a Level 1 only or Level 2 only router
D. when IS-IS neighbors are in an NBMA environment like over Frame Relay
E. when IS-IS neighbors are in a broadcast environment like an Ethernet LAN
Correct Answer: B
QUESTION 5
What is function of the RP/0/RSP0/CPU0:PE1(config-ospf)#distance Cisco IOS-XR command?
A. To modify the administrative distance of the OSPF routes
B. To modify the default seed metric of the OSPF external routes
C. To modify the OSPF default reference bandwidth
D. To modify the OSPF cost
Correct Answer: A
QUESTION 6
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 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.
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 announces a default route to each service provider.
D. Load balancing can be achieved using the maximum-paths command.
Correct Answer: A
QUESTION 7
Refer to the exhibit.
R1 and XR2 cannot establish OSPF adjacency. Which option is the root cause of this issue?
A. stub flag mismatch
B. mismatched passwords
C. process ID mismatch
D. mismatched authentication types
E. MTU mismatch
Correct Answer: D
QUESTION 8
Which three BGP configuration groupings are supported on Cisco IOS XR Software? 642-883 dumps (Choose three.)
A. peer-group
B. af-group
C. bgp-group
D. session-group
E. neighbor-group
F. as-group
Correct Answer: BDE
QUESTION 9
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
QUESTION 10
A service provider is running BGP with clients at the edge of the network. The service provider sees that routing updates from one site are being dropped when the other site receives them.
Which feature fixes this issue?
A. EBGP multihop
B. inter-AS peering
C. AS-override
D. allow-AS in
Correct Answer: C
QUESTION 11
What are two purposes of the BGP scan-time command? (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
QUESTION 12
When implementing OSPF, which type of networks require DR/BDR election?
A. point-to-point networks
B. mutli-access broadcast networks
C. non-broadcast multi-access networks (Hub and Spoke Frame Relay) using point-to-multipoint OSPF network type
D. All networks type
Correct Answer: B
QUESTION 13
Refer to the exhibit.
XR1 must have XR4 as the primary exit point for only the first three subnets received from AS 100 and may not impact the rest of the subnets. Which configuration on XR1 is correct?
A. prefix-set PREFER
100.100.100.0/30 le 32
route-policy LP
if destination in PREFER then set local-preference 200 endif
B. route-policy LP
if destination in (100.100.100.0/30 le 32) then set local- preference 200 else pass endif
C. prefix-set PREFER
100.100.100.0/29 le 32
route-policy LP
if destination in PREFER then set local-preference 200 else pass endif
D. route-policy LP
if destination in (100.100.100.0/29 le 32) then set local preference 200 else set local-preference 100
endif
Correct Answer: B
QUESTION 14
Which BGP attribute is a set of generic tags that can be used to signal various routing policies between BGP routers? 642-883 dumps
A. AS path
B. MED
C. weight
D. communities
E. route tags
Correct Answer: D
QUESTION 15
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
Correct Answer: D
QUESTION 16
Which two OSPF network scenarios require OSPF virtual link configuration? (Choose two.)
A. to connect an OSPF non-backbone area to area 0 through another non-backbone area
B. to connect an NSSA area to an external routing domain
C. to connect two parts of a partitioned backbone area through a non-backbone area
D. to enable route leaking from Level 2 into Level 1
E. to enable route leaking from Level 1 into Level 2
F. to enable OSPF traffic engineering
Correct Answer: AC
QUESTION 17
Which value must be configured when redistributing OSPFv2 into RIP?
A. metric
B. bandwidth
C. delay
D. MTU
E. reliability
Correct Answer: A
QUESTION 18
When troubleshooting OSPF neighbor errors, which three verification steps should be considered? (Choose three.)
A. Verify if neighboring OSPF interfaces are configured in the same area.
B. Verify if neighboring OSPF interfaces are configured with the same OSPF process ID.
C. Verify if neighboring OSPF interfaces are configured with the same OSPF priority.
D. Verify if neighboring OSPF interfaces are configured with the same hello and dead intervals.
E. Verify if neighboring OSPF interfaces are configured with the same area type.
Correct Answer: ADE
QUESTION 19
Which three statements are true regarding the OSPF router ID? 642-883 dumps (Choose three.)
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.
Correct Answer: ABD
QUESTION 20
What are two purposes of the BGP scan-time command? (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
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