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2021 Feb ccie written exam:

Q171. Refer to the exhibit. 

Which three statements about the output are true? (Choose three.) 

A. This switch is currently receiving a multicast data stream that is being forwarded out VLAN 150. 

B. A multicast receiver has requested to join one or more of the multicast groups. 

C. Group 224.0.1.40 is a reserved address, and it should not be used for multicast user data transfer. 

D. One or more multicast groups are operating in PIM dense mode. 

E. One or more of the multicast data streams will be forwarded out to neighbor 10.85.20.20. 

F. Group 239.192.1.1 is a reserved address, and it should not be used for multicast user data transfer. 

Answer: A,B,C 

Explanation: 

A. VLAN 150 shows up in the outgoing interface list so those specific multicast streams are being forwarded to this VLAN. 

B. A receiver has requested to receive the multicast stream associated with the multicast address of 239.192.1.1, that is why this stream appears in the mroute table. 

C. The 224.0.1.40 is a reserved multicast group for cisco's Rp descovery. All cisco routers are members of this grup by default and listen to this group for Cisco RP discovery messages advertised by mapping agent even if it is not configured 


Q172. Refer to the exhibit. 

Which command is configured on this router? 

A. bgp update-delay 60 

B. neighbor 10.100.1.1 maximum-prefix 200 

C. neighbor 10.100.1.1 maximum-path 2 

D. neighbor 10.100.1.1 ebgp-multihop 2 

Answer: B 

Explanation: 

The BGP Maximum-Prefix feature allows you to control how many prefixes can be received from a neighbor. By default, this feature allows a router to bring down a peer when the number of received prefixes from that peer exceeds the configured Maximum-Prefix limit. This feature is commonly used for external BGP peers, but can be applied to internal BGP peers also. When the maximum number of prefixes has been received, the BGP sessions closes into the IDLE state. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/25160-bgp-maximum-prefix.html 


Q173. Which two message types allow PIM snooping to forward multicast traffic? (Choose two.) 

A. hello messages 

B. leave messages 

C. membership query messages 

D. bidirectional PIM DF election messages 

Answer: A,D 


Q174. Refer to the exhibit. 

R1 is performing mutual redistribution, but OSPF routes from R3 are unable to reach R2. Which three options are possible reasons for this behavior? (Choose three.) 

A. R1 requires a seed metric to redistribute RIP. 

B. The RIP version supports only classful subnet masks. 

C. R1 is filtering OSPF routes when redistributing into RIP. 

D. R3 and R1 have the same router ID. 

E. R1 and R3 have an MTU mismatch. 

F. R2 is configured to offset OSPF routes with a metric of 16. 

Answer: A,C,F 

Explanation: 

A. RIP requires a seed metric to be specified when redistributing routes into that protocol. A seed metric is a "starter metric" that gives the RIP process a metric it can work with. The OSPF metric of cost is incomprehensible to RIP, since RIP's sole metric is hop count. We've got to give RIP a metric it understands when redistributing routes into that protocol, so let's go back to R1 and do so. 

C. Filtering routes is another explanation, if the routes to R2 are boing filtered from being advertised to R1. 

F. If the metric is offset to 16, then the routes will have reached the maximum hop count when redistributed to RIP. The max hop count for RIP is 16. 


Q175. Refer to the exhibit. 

Why is the neighbor relationship between R2 and R4 shown as ES-IS? 

A. because there is an MTU mismatch between R2 and R4 

B. because interface S3/0 of R4 is configured as L1/L2 

C. because interface S3/0 of R2 is configured as L1 

D. because there is a hello interval mismatch between R2 and R4 

Answer: C 

Explanation: 

With IS-IS we will see ES-IS when one of the following is true: 

. uk.co.certification.simulator.questionpool.PList@138b7160 

So in this question because we do not know about the other side’s “show CLNS neighbor” A must be the better choose. 


Avant-garde 400-101 ccie written passing score:

Q176. Refer to the exhibit. 

What is a reason for the RIB-failure? 

A. CEF is not enabled on this router. 

B. The route 10.100.1.1/32 is in the routing table, but not as a BGP route. 

C. The routing table has yet to be updated with the BGP route. 

D. The BGP route is filtered inbound and hence is not installed in the routing table. 

Answer: B 

Explanation: 

A rib-failure occurs when BGP tries to install the bestpath prefix into the RIB, but the RIB rejects the BGP route because a route with better administrative distance already exists in the routing table. An inactive Border Gateway Protocol (BGP) route is a route that is not installed in the RIB, but is installed in the BGP table as rib-failure. Example Topology Router 1 (R1) and router 2 (R2) have two parallel links; one links runs BGP AS 65535 and the other link runs Enhanced Interior Gateway Routing Protocol (EIGRP) AS 1. Both BGP and EIGRP are advertising the network 10.1.1.1/32 on R1. 

R2 learns about the 1.1.1.1/32 route through both EIGRP and BGP, but installs only the EIGRP route in the routing table because of the lower administrative distance. Since the BGP route is not installed in the R2 routing table, the route appears as a rib-failure in the R2 BGP table. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/116146-config-bgp-next-hop-00.html 


Q177. Which two statements about the default behavior of IS-IS are true? (Choose two.) 

A. The default IS-IS router type is L1/L2. 

B. The default IS-IS metric type is wide. 

C. The default IS-IS interface circuit type is L1/L2. 

D. By default, two IS-IS routers must use the same hello interval and hold timer in order to become neighbors. 

Answer: A,C 


Q178. DRAG DROP 

Drag and drop the IPv6 prefix on the left to the correct address type on the right. 

Answer: 


Q179. Which statement about the feasible distance in EIGRP is true? 

A. It is the maximum metric that should feasibly be considered for installation in the RIB. 

B. It is the minimum metric to reach the destination as stored in the topology table. 

C. It is the metric that is supplied by the best next hop toward the destination. 

D. It is the maximum metric possible based on the maximum hop count that is allowed. 

Answer: B 

Explanation: 

An EIGRP router advertises each destination it can reach as a route with an attached metric. This metric is called the route's reported distance (the term advertised distance has also been used in older documentation). A successor route for any given destination is chosen as having the lowest computed feasible distance; that is, the lowest sum of reported distance plus the cost to get to the advertising router. By default, an EIGRP router will store only the route with the best (lowest) feasible distance in the routing table (or, multiple routes with equivalent feasible distances). 

Reference: http://packetlife.net/blog/2010/aug/9/eigrp-feasible-successor-routes/ 


Q180. Refer to the exhibit. 

Which technology can be used on the switch to enable host A to receive multicast packets for 239.2.2.2 but prevent host B from receiving them? 

A. IGMP filtering 

B. MLD snooping 

C. IGMP snooping 

D. MLD filtering 

Answer: C 

Explanation: 

IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic. The feature allows a network switch to listen in on the IGMP conversation between hosts and routers. By listening to these conversations the switch maintains a map of which links need which IP multicast streams. Multicasts may be filtered from the links which do not need them and thus controls which ports receive specific multicast traffic.