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2021 Nov 642-883 torrent
Q1. Refer to the exhibit.
Which two configuration options can be used to optimize the IS-IS network scenario? (Choose two.)
A. Change the R1 and R2 IS type to Level 2.
B. Change the R1 and R2 IS type to Level 1.
C. Change the gi0/0 interface IS-IS circuit type on R1 and R2 to Level 2 only.
D. Change the gi0/1 interface IS-IS circuit type on R1and R2 to Level 1.
E. Change the IS type for all the routers to Level-1-2.
F. Change the IS-IS network type for all the routers to point-to-point.
Answer: C,D
Q2. Which high-availability routing feature requires the neighbor router to support the graceful restart capability?
A. BFD
B. NSR
C. NSF
D. MTR
Answer: C
Explanation:
On Cisco IOS XR software, NSF minimizes the amount of time a network is unavailable to its users following a route processor (RP) failover. The main objective of NSF is to continue forwarding IP packets and perform a graceful restart following an RP failover.
When a router restarts, all routing peers of that device usually detect that the device went down and then came back up. This transition results in what is called a routing flap, which could spread across multiple routing domains. Routing flaps caused by routing restarts create routing instabilities, which are detrimental to the overall network performance. NSF helps to suppress routing flaps in NSF-aware devices, thus reducing network instability.
NSF allows for the forwarding of data packets to continue along known routes while the routing protocol information is being restored following an RP failover. When the NSF feature is configured, peer networking devices do not experience routing flaps. Data traffic is forwarded through intelligent line cards while the standby RP assumes control from the failed active RP during a failover. The ability of line cards to remain up through a failover
and to be kept current with the Forwarding Information Base (FIB) on the active RP is key
to NSF operation.
When the Cisco IOS XR router running IS-IS routing performs an RP failover, the router
must perform two tasks to resynchronize its link-state database with its IS-IS neighbors.
First, it must relearn the available IS-IS neighbors on the network without causing a reset of
the neighbor relationship. Second, it must reacquire the contents of the link-state database
for the network.
The IS-IS NSF feature offers two options when configuring NSF:
.IETF NSF
.Cisco NSF
If neighbor routers on a network segment are NSF aware, meaning that neighbor routers are running a software version that supports the IETF Internet draft for router restartability, they assist an IETF NSF router that is restarting. With IETF NSF, neighbor routers provide adjacency and link-state information to help rebuild the routing information following a failover. In Cisco IOS XR software, Cisco NSF checkpoints (stores persistently) all the state necessary to recover from a restart without requiring any special cooperation from neighboring routers. The state is recovered from the neighboring routers, but only using the standard features of the IS-IS routing protocol. This capability makes Cisco NSF suitable for use in networks in which other routers have not used the IETF standard implementation of NSF
Q3. Which option is a tool that is used to ensure that BGP AS does not become a transit AS?
A. as-path filter-list
B. local-preference
C. ttl-security
D. confederations
Answer: A
Q4. 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?
A. Enable BFD on the OSPF interfaces and on the OSPF routing process.
B. Enable NSR on the OSPF routing process.
C. Enable NSF on the OSPF routing process.
D. Adjust the OSPF cost on the OSPF interfaces.
E. Adjust the OSPF variance parameter.
F. Use the wide-style OSPF metric instead of the narrow-style OSPF metric.
Answer: D
Q5. Which router has the su 10.5.10.0/24 [20/115] entry pointing to NullO in its routing table and why? (Choose two.)
A. CE5
B. PE5
C. PE6
D. The router is summarizing 10.5.10.1/32 into 10.5.10.0/24
E. The router is suppressing the 10.5.10.0/24 route
F. The L2/L1 IS-IS router is blocking the 10.5.10.0/24 interarea route to the L1-only router
Answer: D,F
Explanation:
# show clns route
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Q6. Refer to the OSPF command exhibit.
Which effect does the no-summary command option have?
A. It will cause area 1 to be able to receive non-summarized inter-area routes.
B. It will cause area 1 to not receive any inter-area routes and will use a default route to reach networks in other areas.
C. It will cause area 1 to not receive any external routes and will use a default route to reach the external networks.
D. It will convert the NSSA area into a NSSA totally stubby area.
E. It will convert the stubby area into a NSSA.
F. It will disable OSPF auto-summary.
Answer: B
Explanation:
C:Documents and Settingsuser-nwzDesktop1.JPG
Q7. For a Cisco IOS XR router, under which BGP configuration group can default-originate be added?
A. session-group
B. af-group
C. neighbor-group
D. peer-session template
Answer: B
Q8. On Cisco IOS XR Software, which set of commands is used to enable the gi0/0/0/1 interface for OSPF in area 0?
A. interface gi0/0/0/0 ip address 10.1.1.1 255.255.255.0 ! router ospf 1 network 10.1.1.1 0.0.0.0 area 0
B. interface gi0/0/0/0 ip address 10.1.1.1 255.255.255.0 ! router ospf 1 network 10.1.1.1 255.255.255.255 area 0
C. router ospf 1 area 0 interface GigabitEthernet0/0/0/1
D. interface gi0/0/0/0 ip address 10.1.1.1 255.255.255.0 ip ospf 1 area 0
E. router ospf 1 address-family ipv4 unicast interface GigabitEthernet0/0/0/1 area 0
F. router ospf 1 address-family ipv4 unicast interface GigabitEthernet0/0/0/1 area 0
Answer: C
Q9. A network engineer wants to set the local preference to 100 for the specific BGP community sets of 100:1, 101:1, and 102:1..Which option can the engineer use to implement this through RPL, where the BGP community set list is made by the name of lowpri-communities?
A. route-policy ch-pref if community matches lowpri-communities then set local-preference 100 endif end-policy
B. route-policy ch-pref if community eq lowpri-communities.then set local-preference 100 endif end-policy
C. route-policy ch-pref if community matches-any lowpri-communities.then set local-preference 100 endif end-policy
D. route-policy ch-pref if community neq lowpri-communities.then set local-preference 100 endif end-policy
Answer: C
Q10. 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
Answer: B