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2021 Feb cbt nuggets 640-878:
Q1. Refer to the exhibit.
***Exhibit is Missing***
Which three statements about MPLS LDP operations are true? (Choose three.)
A. The incoming label for 10.2.10.1/32 is 16010 (which is allocated by the local router), and the outgoing label is 22 (as advertised by the next-hop router).
B. The 16003 and 16010 labels are learned from the 192.168.112.40 LDP neighbor.
C. The ImpNull outgoing label for the 192.168.102.0/24 network means that the outgoing label should be removed when sending packets to the 192.168.112.40 next-hop router, when the incoming label is 16003.
D. The ImpNull outgoing label for the 192.168.102.0/24 network means that the local router has not received a label for that network from its neighbor.
E. The Unlabeled outgoing label for 10.10.10.100/32 indicates that a label pop is required when sending packets to the 10.10.10.1 next-hop router.
F. The outgoing label of 22 for 10.2.10.1/32 is learned from the 192.168.112.40 LDP neighbor.
Answer: A,C,F
Q2. A VLAN is a logical grouping of switch ports that belong to which two of these? (Choose two.)
A. the same virtual switch cluster
B. the same IP subnet
C. the same collision domain
D. the same broadcast domain
E. the same virtual routing and forwarding instance
Answer: B,D
Q3. Within an MPLS domain, which table is used by the ingress edge LSR to make forwarding decisions when an unlabeled IP packet is received?
A. FIB
B. LFIB
C. LIB
D. MP-BGP
E. VRF
Answer: A
Q4. Refer to the partial configurations exhibit.
***Exhibit is Missing***
What additional configurations are required to enable inter-VLAN routing for VLANs 10 and 20 on the Cisco ME 3400 switch using the metro IP access image?
A. interface Fa0/1 ip address 192.168.10.1 255.255.255.0 ! interface Fa0/2 ip address 192.168.20.1 255.255.255.0 !
B. interface Fa0/1 ip address 192.168.10.1 255.255.255.0 ! interface Fa0/2 ip address 192.168.20.1 255.255.255.0 !
C. router eigrp 1 network 192.168.10.0 network 192.168.20.0 !
D. interface vlan 10 ip address 192.168.10.1 255.255.255.0 ! interface vlan 20 ip address 192.168.20.1 255.255.255.0 !
E. interface Fa0/1 encapsulation dot1q 10 ip address 192.168.10.1 255.255.255.0 ! interface Fa0/2 encapsulation dot1q 20 ip address 192.168.20.1 255.255.255.0 !
Answer: C
Q5. Which procedure is used as the last resort disaster recovery procedure to completely replace the currently installed IOS XR software on Cisco IOS XR routers?
A. netboot
B. turboboot
C. install recovery
D. install rollback
E. install add and install activate
Answer: B
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Q6. On Cisco routers, the address-family configuration command in BGP configuration mode is used to enable which BGP feature?
A. BGP route policy
B. multiprotocol BGP
C. BGP policy accounting
D. BGP communities
Answer: B
Q7. Which three statements about access control lists on a Cisco IOS router are true? (Choose three)
A. The more specific ACL entries should be placed at the top of the ACL.
B. The generic ACL entries should be placed at the top of the ACL, to filter general traffic and reduce noise on the network.
C. ACLs always search for the most specific entry before taking any filtering action.
D. Router-generated packets cannot be filtered by the interface ACLs on the router.
E. Extended ACLs should be placed as close to the destination as possible.
F. There must be at least one permit statement in an ACL, or all traffic is denied.
Answer: A,D,F
Q8. Which IPv6 address block is reserved for 6to4 tunneling?
A. 2000::/16
B. 2001::/16
C. 2002::/16
D. 3ffe::/16
E. fe80::/16
Answer: C
Q9. When is a route-policy configuration needed on a Cisco IOS XR router using RPL?
A. when enabling an IGP routing protocol configuration
B. when enabling an EBGP peering configuration
C. when enabling an IBGP peering configuration
D. when enabling route redistribution
E. when enabling an LDP peering configuration
Answer: B
Q10. On Cisco IOS XR software, what are the four valid address-family configuration command options in static route configuration mode? (Choose four.)
A. address-family ipv4 unicast
B. address-family ipv6 unicast
C. address-family ipv4 multicast
D. address-family ipv6 multicast
E. address-family vpnv4
F. address-family vpnv6
Answer: A,B,C,D