400-101 Guide

400-101 Exam Royal Pack (In Stock.)

  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
  • Last Updated
  • Jun 18,2018
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Q121. Refer to the exhibit. 

Which action must you take to enable the WAN link to function properly? 

A. Enter a clock rate on the DCE interface. 

B. Enter a clock rate on the DTE interface. 

C. Enter a compression algorithm on both interfaces. 

D. Configure both interfaces for HDLC encapsulation. 



When connecting a serial cable to the serial interface of the router, clocking is provided by an external device, such as a CSU/DSU device. A CSU/DSU (Channel Service Unit/Data Service Unit) is a digital-interface device used to connect a router to a digital circuit. The router is the DTE (Data Terminal Equipment) and the external device is the DCE (Data Communications Equipment), where the DCE provides the clocking. However, in some cases we might connect two routers back-to-back using the routers’ serial interfaces (Example. Inside the router labs). Each router is a DTE by default. Since clocking is required to enable the interface, one of the two routers should function as DCE and should provide clocking. This can be done by using the "clock rate" command, from the interface configuration mode. 

Reference: http://www.omnisecu.com/cisco-certified-network-associate-ccna/how-to-configure-router-serial-interfaces.php 

Q122. Which command sets the maximum segment size for a TCP packet initiated from a router? 

A. ip mtu 

B. ip tcp adjust-mss 

C. ip tcp mss 

D. ip tcp window-size 


Q123. Which two options describe two functions of a neighbor solicitation message? (Choose two.) 

A. It requests the link-layer address of the target. 

B. It provides its own link-layer address to the target. 

C. It requests the site-local address of the target. 

D. It provides its own site-local address to the target. 

E. It requests the admin-local address of the target. 

F. It provides its own admin-local address to the target. 

Answer: A,B 


Neighbor solicitation messages are sent on the local link when a node wants to determine the link-layer address of another node on the same local link (see the figure below). When a node wants to determine the link-layer address of another node, the source address in a neighbor solicitation message is the IPv6 address of the node sending the neighbor solicitation message. The destination address in the neighbor solicitation message is the solicited-node multicast address that corresponds to the IPv6 address of the destination node. The neighbor solicitation message also includes the link-layer address of the source node. 

Figure 1. IPv6 Neighbor Discovery: Neighbor Solicitation Message 

After receiving the neighbor solicitation message, the destination node replies by sending a neighbor advertisement message, which has a value of 136 in the Type field of the ICMP packet header, on the local link. The source address in the neighbor advertisement message is the IPv6 address of the node (more specifically, the IPv6 address of the node interface) sending the neighbor advertisement message. The destination address in the neighbor advertisement message is the IPv6 address of the node that sent the neighbor solicitation message. The data portion of the neighbor advertisement message includes the link-layer address of the node sending the neighbor advertisement message. After the source node receives the neighbor advertisement, the source node and destination node can communicate. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3s/ip6b-xe-3s-book/ip6-neighb-disc-xe.html 

Q124. Which three statements about the differences between Cisco IOS and IOS-XE functionality are true? (Choose three.) 

A. Only IOS-XE Software can host applications outside of the IOS context. 

B. Only the IOS-XE Services Plane has multiple cores. 

C. Only the IOS-XE Data Plane has multiple cores. 

D. Only the IOS-XE Control Plane has multiple cores. 

E. Only IOS-XE module management integrates with packet processing. 

F. Only IOS-XE configuration and control is integrated with the kernel. 

Answer: A,B,C 

Q125. Which three options are best practices for implementing a DMVPN? (Choose three.) 

A. Use IPsec in tunnel mode. 

B. Implement Dead Peer Detection to detect communication loss. 

C. Configure AES for encryption of transported data. 

D. Configure SHA-1 for encryption of transported data. 

E. Deploy IPsec hardware acceleration to minimize router memory overhead. 

F. Configure QoS services only on the head-end router. 

Answer: A,B,C 


Best Practices Summary for Hub-and-Spoke Deployment Model 

This section describes the best practices for a dual DMVPN cloud topology with the hub-and-spoke deployment, supporting IP multicast (IPmc) traffic including routing protocols. 

The following are general best practices: 

. Use IPsec in transport mode 

. Configure Triple DES (3DES) or AES for encryption of transported data (exports of encryption algorithms to certain countries may be prohibited by law). 

Implement Dead Peer Detection (DPD) on the spokes to detect loss of communication between peers. 

. Deploy hardware-acceleration of IPsec to minimize router CPU overhead, to support traffic with low latency and jitter requirements, and for the highest performance for cost. 

. Keep IPsec packet fragmentation to a minimum on the customer network by setting MTU size or using Path MTU Discovery (PMTUD). 

. Use Digital Certificates/Public Key Infrastructure (PKI) for scalable tunnel authentication. 

. Configure a routing protocol (for example, EIGRP, BGP or OSPF) with route summarization help alleviate interface congestion issues and to attempt to keep higher priority traffic from being dropped during times of congestion. 

Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/DMVPDG/DMV PN_1.html 


Drag and drop the OTV component on the left to the function it performs on the right. 


Q127. Which statement about the BGP scope of the cost community is true? 

A. It is shared with IBGP neighbors only. 

B. It is shared with IBGP neighbors and route reflectors. 

C. It is shared with EBGP neighbors only. 

D. It is shared with IBGP and EBGP neighbors. 

E. It is shared with IBGP and confederation peers. 



The BGP Cost Community feature introduces the cost extended community attribute. The cost community is a non-transitive extended community attribute that is passed to internal BGP (iBGP) and confederation peers but not to external BGP (eBGP) peers. The cost community feature allows you to customize the local route preference and influence the best path selection process by assigning cost values to specific routes. 

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

Q128. Refer to the exhibit. 

Router 1 and Router 2 use HSRP to provide first hop redundancy for hosts on the network. 

Which feature can provide additional failover coverage for the PC? 

A. Cisco Express Forwarding 

B. NetFlow 

C. Accounting 

D. Enhanced Object Tracking 



HSRP has a mechanism for tracking the interface line-protocol state. The enhanced object tracking feature separates the tracking mechanism from HSRP. It creates a separate, standalone tracking process that can be used by processes other than HSRP. This feature allows tracking of other objects in addition to the interface line-protocol state. A client process, such as HSRP, can register an interest in tracking objects and request notification when the tracked object changes state. Several clients can track the same object, and can take different actions when the object changes state. This feature increases the availability and speed of recovery of a router system and decreases outages and outage duration. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/blades/3040/software/release/12-2_44_se/configuration/guide/swhsrp.html#wp1083927 

Q129. Which two packet types does an RTP session consist of? (Choose two.) 







Answer: B,C 


An RTP session is established for each multimedia stream. A session consists of an IP address with a pair of ports for RTP and RTCP. For example, audio and video streams use separate RTP sessions, enabling a receiver to deselect a particular stream. The ports which form a session are negotiated using other protocols such as RTSP (using SDP in the setup method) and SIP. According to the specification, an RTP port should be even and the RTCP port is the next higher odd port number. 

Reference: http://en.wikipedia.org/wiki/Real-time_Transport_Protocol 

Q130. Refer to the exhibit. 

Two multicast domains are configured as shown and connected with MSDP, but the two 

domains are unable to communicate. Which two actions can you take to correct the problem? (Choose two.) 

A. Change the peering IP address in AS 65220 to 

B. Change the peering AS on R2 to 65210. 

C. Verify that UDP port 639 is open. 

D. Verify that TCP port 139 is open. 

E. Change the MSDP originator-id to GigabitEthernet 0/0/0 on both routers. 

F. Change the MSDP peering IP address on R2 to 

Answer: A,B 

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