QUESTION 41
How does MPLS Layer 3 VPN function?
A. When a PE device forwards a packet received from a CE device across the provider network, it labels the packet with the label leaned from the source PE device.
B. When a destination PE device receives a labeled packet, it pops the label and uses it to forward the packet to the correct CE device.
C. When a VPN route is learned from a CE device and injected into IGP, a VPN route distinguisher attribute is associated with it.
D. When an EIGRP internal route is redistributed into BGP by one PE and then back into EIGRP by another PE, the originating router ID for the route is changed to the router ID of the first PE.
Correct Answer: B
QUESTION 42
How does BFD protocol work?
A. BFD operates on the route processor module and impacts the route processor CPU utilization.
B. When BFD declares a failure on the primary IGP path, the router on the peer router chooses to use the secondary path.
C. BFD echo packets are sent to the same source IP and different destination IP with TCP port of 3786.
D. BFD control packets are sent via UDP port 3784 to the destination router.
Correct Answer: D
QUESTION 43
An engineer is configuring an NHRP client router to advertise NBMA addresses that are valid for 20 minutes to clients. Which configuration must the engineer apply to interface gigabitethernet0/0/1 to meet the requirement?
A. Router(config-if)# interface gigabitethernet 0/0/1
Router(config-if)# ip nhrp registration timeout 1200
B. Router(config-if)# interface gigabitethernet 0/0/1
Router(config-if)# ip nhrp holdtime 1200
C. Router(config-if)# interface gigabitethernet 0/0/1
Router(config-if)# ip nhrp holdtime 20
D. Router(config-if)# interface gigabitethernet 0/0/1
Router(config-if)# ip nhrp interest 20
Correct Answer: B
QUESTION 44
Which two protocols are used by a P router to transfer VPN traffic between PE routers in an MPLS network? (Choose two.)
A. RSVP
B. LDP
C. MP-BGP
D. OSPF
E. BGP
Correct Answer: BD
QUESTION 45
Which feature filters the IPv6 traffic on Layer 2 untrusted ports?
A. IPv6 RA Guard
B. Binding Table Recovery
C. DHCPv6 Guard
D. IPv6 Source Guard
Correct Answer: D
QUESTION 46
Which routing protocol is used by the PE router to advertise routes to a CE router without redistribution or static afterremoving the RD tag from the P router?
A. BGP IPv4
B. MP-BGP
C. OSPF
D. IS-IS
Correct Answer: A
QUESTION 47
Which IPv6 security feature blocks all traffic from an IPv6 host vhen initially connecting to a switch port except for traffic to gainan IPv6 address and discover IPv6 neighbors?
A. IPv6 DHCP Guard
B. IPv6 Destination Guard
C. IPv6 Source Guard
D. IPv6 RA Guard
Correct Answer: C
QUESTION 48
What is the purpose of an OSPF sham-link?
A. to allow intra-area routing when OSPF is used as the PE-CE connection protocol in an MPLS VPN network
B. to correct OSPF backdoor routing when OSPF is used as the PE-PE connection protocol in an MPLS VPN network
C. to allow inter-area routing when OSPF is used as the PE-CE connection protocol in a MPLS VPN network
D. to correct OSPF backdoor routing when OSPF is used as the PE-CE connection protocol in an MPLS VPN network
Correct Answer: D
QUESTION 49
Which MPLS value is combined with the IP prefix to convert to a VPNv4 prefix?
A. 8-byte Route Distinguisher
B. 8-byte Route Target
C. 16-byte Route Target
D. 16-byte Route Distinguisher
Correct Answer: A
QUESTION 50
What is an advantage of implementing BFD?
A. BFD is deployed without the need to run any routing protocol.
B. BFD provides faster updates for any flapping route.
C. BFD provides millisecond failure detection.
D. BFD provides better capabilities to maintain the routing table.
Correct Answer: C
QUESTION 51
What is a function of the IPV6 DHCP Guard feature for DHCP messages?
A. It blocks only DHCP request messages.
B. If the device is configured as a DHCP server, no message is switched.
C. Only access lists are supported for matching traffic.
D. All client messages are always switched regardless of the device role.
Correct Answer: D
QUESTION 52
What is a function of an end device configured with DHCPv6 guard?
A. If it is configured as a relay agent, only prefix assignments are permitted.
B. If it is configured as a client, messages are switched regardless of the assigned role.
C. If it is configured as a server, only prefix assignments are permitted.
D. If it is configured as a client, only DHCP requests are permitted.
Correct Answer: D
QUESTION 53
The summary route is not shown in the Router_B routing table after this below configuration on Router_A:
interface ethernet0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0
Which Router_A configuration resolves the issue by advertising the summary route to Router_B?
A. interface loopback 0
ip address 172.16.96.1 255.255.255.0
interface Ethernet 0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0
B. interface loopback 0
ip address 172.16.81.1 255.255.255.0
interface Ethernet 0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0
C. interface loopback 0
ip address 172.18.81.1 255.255.255.0
interface Ethernet0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0
D. interface loopback 0
ip address 172.16.79.1 255.255.255.0
interface Ethernet 0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0
Correct Answer: B
QUESTION 54
An engineer creates a default static route on a router with a next hop of 10.1.1.1. On inspection, the engineer finds the router has two VRFs, Red and Blue. The next hop is valid for both VRFs and exists in each assigned VRF. Which configuration achieves connectivity?
A. ip route vrf Red 0.0.0.0 0.0.0.0 10.1.1.1
ip route vrf Blue 0.0.0.0 0.0.0.0 10.1.1.1
B. ip route 0.0.0.0 0.0.0.0 10.1.1.1
C. ip route vrf Red 0.0.0.0 255.255.255.25510.1.1.1
ip route vrf Blue 0.0.0.0 255.255.255.255 10.1.1.1
D. ip route vrf BLUE 0.0.0.0 255.255.255.255 10.1.1.1
ip route vrf RED 0.0.0.0 255.255.255.255 10.1.1.1
Correct Answer: A
QUESTION 55
What is a MPLS PHP label operation?
A. It uses implicit-NULL for traffic congestion from source to destination forwarding.
B. Downstream node signals to remove the label.
C. PE removes the outer label before sending to the P router.
D. It improves P router performance by not performing multiple label lookup.
Correct Answer: B
QUESTION 56
How do devices operate in MPLS L3VPN topology?
A. P routers support PE to PE VPN tunnel without LSP functionality.
B. P and associated PE routers with IGP populate the VRF table in different VPNs.
C. P routers provide connectivity between PE devices with MPLS switching.
D. CE routers connect to the provider network and perform LSP functionality.
Correct Answer: C
QUESTION 57
Which tag is used by the PE router to forward the packet to the correct customer?
A. RT
B. VNI
C. extended-community
D. RD
Correct Answer: A
QUESTION 58
Which protocol must be secured with MD5 authentication across the MPLS cloud to prevent hackers from introducing bogus routers?
A. MP-BGP
B. LDP
C. LSP
D. RSVP
Correct Answer: B
QUESTION 59
Which feature is required for IPv6 Source Guard to block traffic arriving on the server interface from unknown sources?
A. IPV6 ND Inspection
B. DHCPv6 Guard
C. Dynamic ARP Inspection
D. IPV6 RA Guard
Correct Answer: B
QUESTION 60
Which characteristic is representative of a hub-and-spoke topology between PE routers in a Layer 3 MPLS VPN network?
A. Each PE router uses a different RD to identify all branches.
B. The PE routers use different RDs for each VRF to import and export M-BGP prefixes.
C. The PE routers use different RTs to import and export M-BGP prefixes.
D. The PE routers are configured with multiple VRFs for all branches.
Correct Answer: C