QUESTION 1
What is the role of MPBGP in Layer 3 VPN?

A. It propagates VRF reachability information to all members of a VPN community.
B. It provides a list of all Layer 3 VPN members.
C. It transports all traffic between all VPN community members.
D. It keeps a list of available links for Layer 2 forwarding.

Correct Answer: A

QUESTION 2
Which role does the LDP play in establishing label-switched paths in an MPLS network?

A. LDP uses hop-by-hop labels for end-to-end MPLS VPN communication.
B. LDP negotiates QoS experimental bits for packet forwarding.
C. LDP is responsible for determining the shortest path between routers.
D. LDP exchanges label mappings to bind labels to forwarding equivalence classes.

Correct Answer: D

QUESTION 3
Which value is used in the Type field of the ICMPv6 packet header to mark it as a neighbor solicitation message?

A. 134
B. 135
C. 136
D. 137

Correct Answer: B

QUESTION 4
What are two features of BFD? (Choose two.)

A. replaces hello messages
B. intensive on CPU for Layer 2 links
C. reliable
D. requires routing protocols
E. scalable

Correct Answer: CE

QUESTION 5
A switch has been configured to provide DHCP relay on VLAN100 to a server with an IP address of 10.1.1.1. The DHCP server is sending syslog reports of multiple TFTP requests that also originate from the switch. As a result, the server CPU exceeded a configured threshold. Which action does the network administrator recommend to bring the server CPU threshold down?

A. Configure the switch with no ip forward-protocol udp 69 on VLAN100.
B. Configure the switch with a VACL on VLAN100 to deny TFTP.
C. Configure the switch with an access list on VLAN100 to deny TFTP.
D. Configure the switch with ip forward-protocol udp 67 globally.

Correct Answer: A

QUESTION 6
What is the use of IPv6 snooping?

A. captures any type of user traffic to create a binding table
B. captures IPv6 routing protocol packets to analyze
C. required for the operation of IPv6 RA Guard
D. requires an external IPv6 packet analyzer

Correct Answer: A

QUESTION 7
What is the forwarding mechanism in MPLS VPN?

A. A customer packet is encapsulated with a stack of three labels when traversing the MPLS backbone from one end of CE to another CE device.
B. A provider edge (PE) device binds a label to all customer prefixes learned from a customer edge (CE) device and includes the label for the prefix that advertises to other PE devices.
C. Label forwarding across the provider backbone is based on static label switching or static defined paths.
D. The top label determines how that PE device should forward the packet to the CE device and the second label directs the packet to the correct PE device.

Correct Answer: B

QUESTION 8
Which IP precedence value does BFD use to prioritize traffic within an infrastructure device?

A. 4
B. 5
C. 6
D. 7

Correct Answer: C

QUESTION 9
A company is redesigning WAN infrastructure so that all branch sites must communicate via the head office and the head office can directly communicate with each site independently. The network engineer must configure the head office router by considering zero-touch technology when adding new sites in the same WAN infrastructure. Which configuration must be applied to the head office router to meet this requirement?

A. interface Tunnel0
tunnel mode dvmrp
ip nhrp redirect
B. interface Tunnel0
tunnel mode gre multipoint
ip nhrp map multicast dynamic
C. interface Tunnel0
tunnel mode ip
ip nhrp redirect
D. interface Tunnel0
tunnel mode ip
ip nhrp map multicast dynamic

Correct Answer: B

QUESTION 10
How does LDP operate in an MPLS network?

A. When topology changes occur such as a router failure, LDP generates peer discovery messages that terminate the LDP session to propagate an LSP change.
B. Peer routers establish the LDP session, and the LDP neighbors maintain and terminate the session by exchanging messages.
C. When an adjacent LSR receives LDP discovery messages, TCP two-way handshake ensures that the LDP session has unidirectional connectivity.
D. LDP notification messages allow LERs to exchange label information to determine the next hops within a particular LSP.

Correct Answer: B

QUESTION 11
An engineer must configure encrypted packets for a single router OSPF neighborship. Which configuration meets this requirement?

A. interface Ethernet0/2
ip ospf authentication-key exam
B. router ospf 100
area 0 authentication
!
interface Ethernet0/2
ip ospf authentication-key exam
C. router ospf 100
area 0 authentication message-digest-key 1 md5 exam
!
interface Ethernet0/2
ip ospf message-digest-key 1 md5 exam
D. interface Ethernet0/2
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 exam

Correct Answer: D

QUESTION 12
A network engineer wants to redirect HTTP traffic originating from subnet 192.168.4.1/24 to the next-hop IP address of 10.2.4.1. This configuration was implemented:
route-map PBR permit 10
match ip address 100
set ip next-hop 10.2.4.1
!
interface GigabitEthernet0/0
description-To ISP1 link
ip policy route-map PBR

Which command completes the configuration?

A. Router(config)# access-list 100 permit tcp any eq 80 192.168.4.0 0.0.0.255
B. Router(config)# access-list 100 permit tcp 192.168.4.0 0.0.0.255 eq any 80
C. Router(config)# access-list 100 permit tcp any 192.168.4.0 0.0.0.255 eq 80
D. Router(config)# access-list 100 permit tcp 192.168.4.0 0.0.0.255 any eq 80

Correct Answer: D

QUESTION 13
What is a restriction when using the IPv6 RA Guard feature?

A. supported only in the egress direction
B. does not support host mode
C. supported only on EtherChannels
D. supported only in the ingress direction

Correct Answer: D

QUESTION 14
An engineer must confirm whether a router configured as a DHCP server is receiving DHCP requests. Which debug output confirms that the router received DHCP requests?

A. 00:18:48: UDP: sent src=0.0.0.0(68), dst=255.255.255.255(67), length=333
B. 00:18:49: IP: s=0.0.0.0 (Ethernet2/0), d=255.255.255.255, len 604, rcvd 2
C. 00:18:49: UDP src=68, dst=67
00:18:49: IP: s=0.0.0.0 (Ethernet2/0), d=255.255.255.255, len 604, rcvd 2
D. 00:18:49: UDP src=67, dst=68
00:18:49: UDP: sent src=0.0.0.0(67), dst=255.255.255.255(68), length=333

Correct Answer: C

QUESTION 15
Which router attaches the VPN label to incoming packets from CE routing?

A. CE router
B. PE router
C. P router
D. core router

Correct Answer: B

QUESTION 16
What is the failure detection time with BFD?
A. 3 seconds
B. 1 second
C. 2 seconds
D. less than a second

Correct Answer: D

QUESTION 17
What is the function of penultimate hop popping?

A. The transport label is popped off at the egress LSR, and unlabeled traffic is forwarded toward the CE.
B. The second to last P router in the path pops off the VPN label before traffic is forwarded to the last P router.
C. The VPN label is popped off at the egress LSR, and unlabeled traffic is forwarded toward the CE.
D. The last P router in the path pops off the transport label before traffic is forwarded toward the PE.

Correct Answer: D

QUESTION 18
Which two reasons would cause an LSP to break between two PE routers? (Choose two.)

A. IGP hello adjacency
B. matching labels
C. MPLS not enabled
D. prefix mismatch
E. lost LDP adjacency

Correct Answer: DE

QUESTION 19
What are the two major components of an MPLS-based VPN? (Choose two.)

A. MP-BGP peering of VPN community CE devices
B. MP-BGP peering of VPN community PE devices
C. VPN route reflectors
D. VPN route distinguisher
E. MP-BGP peering of VPN community P devices
F. VPN route target communities

Correct Answer: BD

QUESTION 20
What action is performed for untagged outgoing labels in an MPLS router?

A. Convert the untagged packet to a labeled packet and forward it to the next router.
B. Convert the incoming MPLS packet to an untagged packet and then do a RIB lookup.
C. Convert the incoming MPLS packet to an untagged packet and then do a FIB lookup
D. Convert the incoming MPLS packet to an IP packet and forward it to the next router.

Correct Answer: C