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2021 Mar 400-101 practice test

Q491. DRAG DROP 

Drag and drop the PPPoE packet type on the left to the corresponding description on the right. 

Answer: 


Q492. Refer to the exhibit. 

Which BGP feature allows R1 to send R2 a list of prefixes that R2 is prevented from advertising to R1? 

A. route refresh 

B. Prefix-Based Outbound Route Filtering 

C. distribute lists 

D. prefix lists 

Answer:


Q493. DRAG DROP 

Drag and drop the multiprotocol BGP feature on the left to the corresponding description on the right. 

Answer: 


Q494. Refer to the exhibit. 

Why is R2 unable to ping the loopback interface of R4? 

A. The local preference is too high. 

B. The weight is too low. 

C. The next hop is not reachable from R2. 

D. The route originated from within the same AS. 

Answer:

Explanation: 

Before a BGP speaker installs a route to a network in the main IP routing table, the router must know how to reach the next hop that is used to get to that network. Route reachability is verified by searching for a route to the next hop in the main IP routing table. Unlike IGP routing protocols, such as EIGRP and OSPF, which assume that a route is reachable if they learned it through a valid adjacency, BGP does not install routes that it cannot verify as reachable. If a route to the next hop for a BGP network is found in the main IP routing table, BGP assumes that the network is reachable, and that the particular BGP route might be stored in the main IP routing table. If the router receives a route to a network that is not reachable, that route continues to be stored in the incoming BGP table, adj-RIB-In, and might be seen using the show ip bgp command, but is not placed in the main IP routing table. 

Reference: https://www.informit.com/library/content.aspx?b=CCIE_Practical_Studies_II&seqNum=75 


Rebirth 400-101 actual test:

Q495. Which option describes the purpose of the leak-map keyword in the command eigrp stub connected leak-map EigrpLeak? 

A. It allows the specified static routes to be advertised. 

B. It allows exceptions to the route summarization that is configured. 

C. It allows specified EIGRP-learned routes to be advertised. 

D. It restricts specified connected routes from being advertised. 

Answer:

Explanation: 

ExamplE. eigrp stub leak-map Command 

In the following example, the eigrp stub command is issued with the leak-map name keyword-argument pair to configure the device to reference a leak map that identifies routes to be advertised that would have been suppressed otherwisE. 

Device(config)# router eigrp 1 

Device(config-router)# network 10.0.0.0 

Device(config-router)# eigrp stub leak-map map1 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-eigrp-stub-rtg.html#GUID-FB899CA9-E9DE-48D8-8048-C971179E4E24 


Q496. Which two statements about Metro Ethernet services are true? (Choose two.) 

A. EPL is a point-to-point service from one customer site to another across an MPLS 

backbone. 

B. EVPL is a multipoint service that emulates a LAN over an MPLS backbone. 

C. EPLAN is a multipoint service that emulates a LAN over an MPLS backbone. 

D. EVPL is a point-to-point service from one customer site to another across an MPLS backbone. 

E. ELAN is a point-to-point service from one customer site to another across an MPLS backbone. 

F. EVPL is a multipoint service with a root node that is suitable for multicast services. 

Answer: A,B 


Q497. Refer to the exhibit. 

ASN 64523 has a multihomed BGP setup to ISP A and ISP B. Which BGP attribute can you set to allow traffic that originates in ASN 64523 to exit the ASN through ISP B? 

A. origin 

B. next-hop 

C. weight 

D. multi-exit discriminator 

Answer:

Explanation: 

MED is an optional nontransitive attribute. MED is a hint to external neighbors about the preferred path into an autonomous system (AS) that has multiple entry points. The MED is also known as the external metric of a route. A lower MED value is preferred over a higher value. Example at reference link below: 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13759-37.html 


Q498. Which two operating modes does VPLS support? (Choose two.) 

A. transport mode 

B. strict mode 

C. port mode 

D. loose mode 

E. VLAN mode 

F. dynamic mode 

Answer: C,E 


Q499. Refer to the exhibit. 

The interface FastEthernet0/1 of both routers R4 and R5 is connected to the same Ethernet segment with a multicast receiver. Which two statements are true? (Choose two) 

A. Multicast traffic that is destined to a receiver with IP address 192.168.2.6 will flow through router R4. 

B. Both routers R4 and R5 will send PIM join messages to the RP. 

C. Only router R5 will send a multicast join message to the RP. 

D. Multicast traffic that is destined to a receiver with IP address 192.168.2.6 will flow through router R5. 

Answer: C,D 

Explanation: 

Even though R4 is the active HSRP router, traffic will flow through R5 and only R5 will send the join messages. The Multicast DR is elected by the higher IP address or priority. R5 has 192.168.2.2 and R4 has 192.168.2.1. R5 is the DR which sends all packets to the RP.