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2021 Mar 400-101 practice test

Q111. Which two statements are true about unicast RPF? (Choose two.) 

A. Unicast RPF requires CEF to be enabled. 

B. Unicast RPF strict mode works better with multihomed networks. 

C. Unicast RPF strict mode supports symmetric paths. 

D. Unicast RPF strict mode supports asymmetric paths. 

E. CEF is optional with Unicast RPF, but when CEF is enabled it provides better performance. 

Answer: A,C 

Explanation: 

Unicast RPF requires Cisco express forwarding (CEF) to function properly on the router. 

Strict Versus Loose Checking Mode 

The Unicast RPF in Strict Mode feature filters ingress IPv4 traffic in strict checking mode and forwards packets only if the following conditions are satisfied. 

. An IPv4 packet must be received at an interface with the best return path (route) to the packet source (a process called symmetric routing). There must be a route in the Forwarding Information Base (FIB) that matches the route to the receiving interface. Adding a route in the FIB can be done via static route, network statement, or dynamic routing. 

. IPv4 source addresses at the receiving interface must match the routing entry for the interface. 

References: 

http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfrpf. html 

http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/srpf_gsr.html 


Q112. Refer to the exhibit. 

Which two conditions can cause this error message to be displayed on the console? (Choose two.) 

A. The EtherChannel is configured as desirable on both ends. 

B. The port-channel on the adjacent device is misconfigured. 

C. There is a speed and duplex mismatch on interface fa0/12. 

D. The EtherChannel is configured as auto on one of the interfaces. 

Answer: B,C 


Q113. Which two options are causes of out-of-order packets? (Choose two.) 

A. a routing loop 

B. a router in the packet flow path that is intermittently dropping packets 

C. high latency 

D. packets in a flow traversing multiple paths through the network 

E. some packets in a flow being process-switched and others being interrupt-switched on a transit router 

Answer: D,E 

Explanation: 

In traditional packet forwarding systems, using different paths have varying latencies that cause out of order packets, eventually resulting in far lower performance for the network application. Also, if some packets are process switched quickly by the routing engine of the router while others are interrupt switched (which takes more time) then it could result in out of order packets. The other options would cause packet drops or latency, but not out of order packets. 


Q114. Which three values can you use to configure an ERSPAN destination session? (Choose three.) 

A. VLAN ID 

B. source IP address 

C. destination IP address 

D. ID number 

E. VRF 

F. session name 

Answer: B,D,E 


Q115. Which two statements about the function of PIM designated router are true? (Choose two.) 

A. It registers directly connected source to the PIM rendezvous point. 

B. It sends PIM asserts on the interface of the outgoing interface list. 

C. It sends PIM Join/Prune messages for directly connected receivers. 

D. It forwards multicast traffic from the source into the PIM network. 

E. It sends IGMP queries. 

Answer: A,C 


Renew 400-101 latest exam:

Q116. Into which two pieces of information does the LISP protocol split the device identity? (Choose two.) 

A. Routing Locator 

B. Endpoint Identifier 

C. Resource Location 

D. Enterprise Identifier 

E. LISP ID 

F. Device ID 

Answer: A,B 


Q117. DRAG DROP 

Drag and drop the LACP elements on the left into the correct priority order in the hot-standby port-selection process on the right. 

Answer: 


Q118. Which two options are signaling protocols that are used in MPLS? (Choose two.) 

A. LDP 

B. RSVP 

C. BFD 

D. LISP 

E. CLNS 

F. CDP 

Answer: A,B 

Explanation: 

* Signaling is the means by which LSRs all along the path know that they are a part of a given LSP. It is a signaling function by which the LSR knows that the internal transit path for the LSP depicted goes from Interface 2 to Interface 4. 

* Label distribution is the means by which an LSR tells an upstream LSR what label value to use for a particular LSP. 

There are four protocols that can perform the label distribution function: 

* Label Distribution Protocol (LDP) 

* Resource Reservation Protocol with Traffic Engineering Extensions (RSVP-TE) 

* Constraint-Based Routed LDP (CR-LDP) 

* Multiprotocol BGP 

LDP and RSVP-TE are the two most commonly used label distribution protocols 

Reference: http://www.networkworld.com/article/2237487/cisco-subnet/understanding-mpls-label-distribution.html 


Q119. In which way does the Bridge Assurance mechanism modify the default spanning-tree behavior in an effort to prevent bridging loops? 

A. Received BPDUs are looped back toward the sender to ensure that the link is bidirectional. 

B. If BPDUs are no longer received on a port, the switch immediately sends out a TCN BPDU. 

C. Extended topology information is encoded into all BPDUs. 

D. BPDUs are sent bidirectional on all active network ports, including blocked and alternate ports. 

Answer: D 


Q120. Which two statements about PBR route maps are true? (Choose two.) 

A. They can use extended ACLs to identify traffic. 

B. They can route unicast traffic without interface-level classification. 

C. They can be applied to both ingress and egress traffic. 

D. They can classify traffic based on prefix-lists. 

E. They can set the metric and IP precedence bits. 

Answer: A,B