QUESTION 21
An engineer configured OSPF on all routers in the data center in the same exchange as other routers. Layer 2 connectivity was established. Now, the engineer plans to implement BFD to detect failures in the forwarding path. Which action must the engineer take?
A. Configure CEF before implementing BFD.
B. Configure BFD between each adjacent router.
C. Configure IS-IS routing before implementing BFD.
D. Configure BFD on any one of the routers.
Correct Answer: A
QUESTION 22
What is the difference between RPL and route-maps?
A. Unlike RPL, route-maps are designed for BGP protocol only.
B. Unlike RPL, route-maps are supported with IPv4 address families only.
C. Unlike route-maps, only RPL is designed for bulk configuration of multiple devices.
D. Unlike route-maps, only RPL supports extcommunity sets to group extended communities.
Correct Answer: D
QUESTION 23
An engineer must implement PIM-SSM in the network to support a new multicast messaging service. All the routers in the network run a distance vector routing protocol. Unicast routing is established on the network and is working normally. What must the engineer enable to continue the implementation process?
A. PIM dense mode on all devices on the network
B. PIM dense mode and IGMPv2 on all interfaces that participate in multicast
C. PIM RP feature on the network
D. IGMPv3 on all interfaces that participate in multicast
Correct Answer: D
QUESTION 24
What is the function of BGP confederations?
A. They require routers to use private AS numbers.
B. They assign an external BGP router to serve as the route reflector.
C. They eliminate the need for a fully-meshed internal BGP design.
D. They enable a single device to distribute a common configuration to its peers.
Correct Answer: C
QUESTION 25
Which difference should be considered when intradomain or interdomain multicast routing is implemented?
A. Interdomain multicast routing uses BIDR-PIM to establish neighbor relationships between AS, and intradomain multicast routing uses MSDP.
B. Interdomain multicast routing relies on PIM-DM, and intradomain multicast routing relies on PIM-SM.
C. Interdomain multicast routing requires an IS-IS or OSPF neighbor relationship between the domains, but intradomain multicast routing requires only BGP.
D. A network uses intradomain multicast routing without interdomain routing, but networks that use interdomain multicast routing must also apply intradomain routing.
Correct Answer: D
QUESTION 26
When deploying a nationwide network of routers, what is the benefit of using BGP confederations?
A. availability
B. security
C. automatability
D. scalability
Correct Answer: D
QUESTION 27
What are two features of dual-stack? (Choose two.)
A. It is implemented without excessive processing power.
B. It securely routes and tunnels traffic between separate sites over the Internet
C. It requires tunneling IPv6 traffic over an IPv4 infrastructure.
D. It allows an engineer to stack multiple Layer 2 switches to serve as a single switching unit.
E. It supports IPv4 and IPv6 traffic on the same infrastructure.
Correct Answer: AE
QUESTION 28
What is the role of a segment routing mapping server?
A. It works with IGP instances to calculate the prefix SIDs in the absence of a mapping policy.
B. It advertises a local SID mapping policy to all of the mapping clients.
C. It selects multiple mapping entries to create overlapping active mapping policies.
D. It reads and translates remotely received SIDs from other mapping servers to create SID mapping entries.
Correct Answer: B
QUESTION 29
What is the difference between a source tree and a shared tree in a multicast environment?
A. To stream multicast from source to receiver, a source tree uses PIM-SM and a shared tree uses PIM-DM.
B. A source tree has its root at the source, and a shared tree has its root at a designated rendezvous point.
C. Source trees are the default type for bidirectional PIM, and PIM-DM uses shared trees by default
D. To route traffic from source to receiver, a source tree uses a link state routing protocol and a shared tree uses a distance-vector routing protocol.
Correct Answer: B
QUESTION 30
Which keyword is used with the match route-type command to redistribute the external BGP and IGP routes using route map?
A. match route-type type-2
B. match route-type type-1
C. match route-type nssa-external
D. match route-type external
Correct Answer: D
QUESTION 31
Which expression, when used with the as-path-set command, matches the AS path attribute of the route?
A. dfa-regex
B. neighbor-is
C. ios-regex
D. Length
Correct Answer: C
QUESTION 32
How does SRv6 function on the control plane?
A. The ingress node of the SR domain swaps the SRv6 header for the IPv6 header.
B. The ingress node of the SR domain adds a uSID format lPv6 header to carry the SRv6 locator.
C. The egress node of the SR domain imposes a new outer IPv6 header.
D. It enables SRH-capable nodes to terminate lPv6 packets at the network egress to carry the SRv6 locator.
Correct Answer: D
QUESTION 33
A network operator working for a telecommunication company is planning to implement the Nonstop Forwarding (NSR) feature on the customer’s core network. After getting the configuration ready for NSR, on which router should the opera to implement NSR changes?
A. on the CE router
B. on the ABR router
C. on the ASBR router
D. on the PE router
Correct Answer: D
QUESTION 34
A network administrator is planning an upgrade for a PE router that has BGP peering sessions with several CE routers. The SLA has stringent uptime requirements, so the administrator wants to implement BGP NSR with SSO to provide fast convergence during the upgrade. Which action must the engineer take as part of the NSR implementation?
A. Configure a VRF on each CE router on the interface that connects to the PE router.
B. Configure MPLS on the link between the PE and CE routers.
C. Configure the clear ip bgp 65514 soft in command on the PE and CE routers.
D. Configure the bgp graceful-restart command on the PE router.
Correct Answer: D
QUESTION 35
How does the SRv6 IS-IS Flexible Algorithm function on the data plane?
A. It applies path computation algorithms to learn the topology and compute a pair of disjoint LSPs.
B. It uses the IGP metric in its path calculations to optimize reachability.
C. It uses the TE metric in its path calculations to optimize the cumulative TE metric.
D. It automatically delivers traffic to the destination over an engineered path computed by the IGP.
Correct Answer: D
QUESTION 36
What is one of the purposes of a default Multicast Distribution Tree?
A. to define the RP for PIM sparse mode and the different leafs
B. to offload traffic from data MDT
C. to support control traffic between different VRFs
D. to handle high-bandwidth source streams
Correct Answer: C
QUESTION 37
What is a restriction of 6PE?
A. It is implemented only over eBGP peers.
B. It is implemented only over iBGP peers.
C. It adds a value of ::FFFE: on the IPv4 next hop address
D. It cannot be implemented on VRFs.
Correct Answer: C
QUESTION 38
Which requirement must be met while using parameter with conditional matching in routing policy definition?
A. Parameters must be used in a hierarchal structure.
B. Parameters must be used only in route maps.
C. Parameters must start with the $ symbol.
D. Parameters must be applied only to BGP statements.
Correct Answer: C
QUESTION 39
A network engineer must implement a segment routing policy rule that specifies that SIDs are bounded manually. The policy will be used for traffic steering based on incoming label traffic with the binding SIDs, adjacency SIDs, and BGP peering SIDs. All labels will be in the local segment with the range from 40000 to 50000. How must the engineer implement dynamic label allocation?
A. Implement a non-default SRGB range in the SR local segment.
B. Implement the standard default SRGB range in the SR global segment.
C. Implement the default SRLB range in the SR local segment.
D. Implement a non-default SRLB range in the SR global segment.
Correct Answer: A
QUESTION 40
What is the purpose of the confederation identifier in a BGP confederation?
A. It advertises routes outside of the confederation’s autonomous system.
B. It reflects the route reflector cluster ID within the confederation.
C. It carries the AS number within the confederation’s local autonomous system.
D. It identifies the autonomous system that belongs to the confederation.
Correct Answer: C