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2021 Apr 400-101 sample question
Q391. Refer to the exhibit.
Which statement is true about why the first-hop PIM IPv6 router is stuck in registering?
A. The scope of the IPv6 multicast address is link-local.
B. The outgoing interface for the IPv6 multicast group should not be a tunnel interface.
C. The R-bit is set in the IPv6 address, but this is not an embedded RP multicast IPv6 address.
D. The S flag should not be set on a first-hop PIM router.
E. A multicast IPv6 address does not start with FF.
Answer: C
Explanation:
.R bit: RP bit: R = 1 indicates the address embeds the address of the Rendezvous Point (RP). The embedded RP address needs to begin with the prefix FF70::/12, But here we see that the address is FF7E::1234.
Q392. Which three features does GETVPN support to improve deployment and scalability? (Choose three.)
A. configuration of multiple key servers to work cooperatively
B. allowing traffic to be discarded until a group member registers successfully
C. local exceptions in the traffic classification ACL
D. GDOI protocol configuration between group members and the key server
E. redundant IPsec tunnels between group members and the key server
F. redundant multicast replication streaming through the use of a bypass tunnel
Answer: A,B,C
Q393. Which statement about MSS is true?
A. It is negotiated between sender and receiver.
B. It is sent in all TCP packets.
C. It is 20 bytes lower than MTU by default.
D. It is sent in SYN packets.
E. It is 28 bytes lower than MTU by default.
Answer: D
Explanation:
The maximum segment size (MSS) is a parameter of the Options field of the TCP header that specifies the largest amount of data, specified in octets, that a computer or communications device can receive in a single TCP segment. It does not count the TCP header or the IP header. The IP datagram containing a TCP segment may be self-contained within a single packet, or it may be reconstructed from several fragmented pieces; either way, the MSS limit applies to the total amount of data contained in the final, reconstructed TCP segment. The default TCP Maximum Segment Size is 536. Where a host wishes to set the maximum segment size to a value other than the default, the maximum segment size is specified as a TCP option, initially in the TCP SYN packet during the TCP handshake. The value cannot be changed after the connection is established.
Reference: http://en.wikipedia.org/wiki/Maximum_segment_size
Q394. Which two statements about GLBP are true? (Choose two.)
A. Packets are forwarded by multiple routers that share one virtual IP address.
B. The active router forwards packets received on one virtual IP and MAC address.
C. The standby router forwards packets when the active router fails.
D. Hosts on the network are configured with multiple gateways for load balancing.
E. Routers in a GLBP group can share multiple virtual MAC addresses.
Answer: A,E
Q395. Refer to the exhibit.
How can the EIGRP hello and hold time for Gig0/0 be changed to 5 and 15?
A. No action is required, since Gig0/0 is not listed with a nondefault hello and hold time.
B. Add the commands ip hello-interval eigrp 1 5 and ip hold-time eigrp 1 15 under interface Gig0/0.
C. Add the commands hello-interval 5 and hold-time 15 under "af-interface Gig0/0" under the address family.
D. Add the commands default hello-interval and default hold-time under the af-interface Gig0/0 statement under the address family.
Answer: C
Explanation:
To configure the hello interval for an interface, use the hello-interval command in interface configuration mode To configure the hold time for an interface, use the hold-time command in interface configuration mode.
Reference: http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-1/routing/command/reference/b_routing_cr41crs/b_routing_cr41crs_chapter_010.html#wp2 323069468
Renewal 400-101 exam cost:
Q396. When deploying redundant route reflectors in BGP, which attribute can you configure on the route reflector to allow routes to be identified as belonging to the same group?
A. ROUTER_ID
B. CLUSTER_ID
C. ORIGINATOR_ID
D. PEER_GROUP
Answer: B
Explanation:
Together, a route reflector and its clients form a cluster. When a single route reflector is deployed in a cluster, the cluster is identified by the router ID of the route reflector. The bgp cluster-id command is used to assign a cluster ID to a route reflector when the cluster has one or more route reflectors. Multiple route reflectors are deployed in a cluster to increase redundancy and avoid a single point of failure. When multiple route reflectors are configured in a cluster, the same cluster ID is assigned to all route reflectors. This allows all route reflectors in the cluster to recognize updates from peers in the same cluster and reduces the number of updates that need to be stored in BGP routing tables.
Reference: http://ieoc.com/forums/t/5326.aspx
Q397. Which two statements about OSPF default route injection are true? (Choose two.)
A. The ABR requires manual configuration to send a default route into an NSSA area.
B. The ABR injects a default route into a Totally Stub Area.
C. In a stub area, the ASBR generates a summary LSA with link-state ID 0.0.0.0.
D. If the default route is missing from the routing table, the ASBR can use the default-information originate command to advertise the default into the OSPF domain.
E. By default, OSPF normal areas will generate default routes into the routing domain if a default route exists.
Answer: A,B
Q398. Which mechanism can be used on Layer 2 switches so that only multicast packets with downstream receivers are sent on the multicast router-connected ports?
A. IGMP snooping
B. Router Guard
C. PIM snooping
D. multicast filtering
Answer: C
Explanation:
Ideally, the Layer 2 device should forward the multicast transmission only out ports to which receivers are connected and also out any ports that are connected to downstream multicast routers. This configuration requires a Layer 2 device to be able to determine the ports on which multicast routers and receivers for each separate (S,G) or (*,G) multicast group are located. To facilitate intelligent forwarding of multicast traffic on the LAN, Cisco Catalyst switches support two mechanisms:
. IGMP snooping — The switch listens in or "snoops" IGMP communications between receivers and multicast routers. This snooping enables the switch to determine which ports are connected to receivers for each multicast group and which ports are connected to multicast routers.
. Cisco Group Management Protocol (CGMP) — The switch communicates with multicasts routers, with multicast routers relaying group membership information to switches.
Reference: https://www.informit.com/library/content.aspx?b=CCNP_Studies_Switching&seqNum=59
Q399. Which component of the BGP ORF can you use to permit and deny routing updates?
A. match
B. action
C. AFI
D. SAFI
E. ORF type
Answer: A
Q400. Which two statements about route summarization are true? (Choose two.)
A. RIP, IGRP, and EIGRP can automatically summarize routing information at network address boundaries.
B. EIGRP can automatically summarize external routes.
C. The area range command can aggregate addresses on the ASBR.
D. The summary-address command under the router process configures manual summarization on RIPv2 devices.
E. The ip classless command enables classful protocols to select a default route to an unknown subnet on a network with other known subnets.
Answer: A,E