400-101 Guide

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  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
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  • Jun 18,2018
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2017 Mar 400-101 testing engine

Q481. Which BGP feature allows BGP routing tables to be refreshed without impacting established BGP sessions? 

A. BGP synchronization 

B. soft reconfiguration 

C. confederations 

D. hard reset 



Clearing a BGP session using a hard reset invalidates the cache and results in a negative impact on the operation of networks as the information in the cache becomes unavailable. Soft reset is recommended because it allows routing tables to be reconfigured and activated without clearing the BGP session. Soft reset is done on a per-neighbor basis. 

Reference: http://www.cisco.com/en/US/products/ps6599/products_data_sheet09186a0080087b3a.ht ml 

Q482. Which two protocols are not protected in an edge router by using control plane policing? (Choose two.) 




D. Telnet 

Answer: A,B 


A CoPP policy can limit a number of different packet types that are forwarded to the control plane. Traffic destined for the switch CPU includes: 

. Address Resolution Protocol (ARP) 

. First-hop redundancy protocol packets 

. Layer 2 control packets 

. Management packets (telnet, Secure Shell [SSH] Protocol, Simple Network Management Protocol [SNMP]) <--- C and D are not correct. 

. Multicast control packets 

. Routing protocol packets 

. Packets with IP options 

. Packets with time to live (TTL) set to 1 

. Packets that require ACL logging 

. Packets that require an initial lookup (first packet in a flow: FIB miss) 

. Packets that have don't support hardware switching/routing 

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/white_paper_c11_553261.html 

Q483. Which two types of traffic are blocked when the storm control threshold for multicast traffic is reached on a port? (Choose two.) 






Answer: B,D 

Q484. Which three statements about RIPng are true? (Choose three.) 

A. It supports route tags. 

B. It sends updates on FF02::9. 

C. Its RTE last byte is 0XFF. 

D. It supports authentication. 

E. It sends updates on UDP port 520. 

F. It can be used on networks of greater than 15 hops. 

Answer: A,B,C 

Q485. Refer to the exhibit. 

If a console port is configured as shown, which response is displayed when you connect to the console port? 

A. a blinking cursor 

B. the message "Authorized users only" 

C. the username prompt 

D. three username name prompts followed by a timeout message 

E. the message "Connection refused" 


Regenerate 400-101 exam guide:

Q486. Refer to the exhibit. 

R3 prefers the path through R1 to reach host 

Which option describes the reason for this behavior? 

A. The OSPF reference bandwidth is too small to account for the higher speed links through R2. 

B. The default OSPF cost through R1 is less than the cost through R2. 

C. The default OSPF cost through R1 is more than the cost through R2. 

D. The link between R2 and R1 is congested. 



The default formula to calculate OSPF bandwidth is BW = Bandwidth Reference / interface 

bandwidth [bps] = 10^8 / / interface bandwidth [bps] 

BW of the R1-R3 link = 10^8 / 100Mbps = 10^8 / 10^8 = 1 

BW of the R2-R3 link = 10^8 / 1Gbps = 10^8 / 10^9 = 1 (round up) 

Therefore OSPF considers the two above links have the same Bandwidth -> R3 will go to via the R1-R3 link. The solution here is to increase the Bandwidth Reference to a higher value using the “auto-cost reference-bandwidth” command under OSPF router mode. For example: Router(config)#router ospf 1 Router(config-router)#auto-cost reference-bandwidth 10000 This will increase the reference bandwidth to 10000 Mbps which increases the BW of the R2-R3 link to 10^10 / 10^8 = 100. 

Q487. Which two commands enable OSPF graceful shutdown? (Choose two.) 

A. nsf cisco 

B. ip ospf shutdown 

C. shutdown 

D. nsf ietf helper disable 

Answer: B,C 

Q488. Which three statements about implementing an application layer gateway in a network are true? (Choose three.) 

A. It allows client applications to use dynamic ports to communicate with a server regardless of whether NAT is being used. 

B. It maintains granular security over application-specific data. 

C. It allows synchronization between multiple streams of data between two hosts. 

D. Application layer gateway is used only in VoIP/SIP deployments. 

E. Client applications require additional configuration to use an application layer gateway. 

F. An application layer gateway inspects only the first 64 bytes of a packet before forwarding it through the network. 

Answer: A,B,C 


An ALG may offer the following functions: 

. allowing client applications to use dynamic ephemeral TCP/ UDP ports to communicate with the known ports used by the server applications, even though a firewall configuration may allow only a limited number of known ports. In the absence of an ALG, either the ports would get blocked or the network administrator would need to explicitly open up a large number of ports in the firewall — rendering the network vulnerable to attacks on those ports. 

. converting the network layer address information found inside an application payload between the addresses acceptable by the hosts on either side of the firewall/NAT. This aspect introduces the term 'gateway' for an ALG. 

. recognizing application-specific commands and offering granular security controls over them 

. synchronizing between multiple streams/sessions of data between two hosts exchanging data. For example, an FTP application may use separate connections for passing control commands and for exchanging data between the client and a remote server. During large file transfers, the control connection may remain idle. An ALG can prevent the control connection getting timed out by network devices before the lengthy file transfer completes. 

Reference: http://en.wikipedia.org/wiki/Application-level_gateway 

Q489. Which statement about OTV is true? 

A. The overlay interface becomes active only when configuration is complete and it is manually enabled. 

B. OTV data groups can operate only in PIM sparse-mode. 

C. The overlay interface becomes active immediately when it is configured. 

D. The interface facing the OTV groups must be configured with the highest MTU possible. 



OTV has the following configuration guidelines and limitations: 

. If the same device serves as the default gateway in a VLAN interface and the OTV edge device for the VLANs being extended, configure OTV on a device (VDC or switch) that is separate from the VLAN interfaces (SVIs). 

. When possible, we recommend that you use a separate nondefault VDC for OTV to allow for better manageability and maintenance. 

. An overlay interface will only be in an up state if the overlay interface configuration is complete and enabled (no shutdown). The join interface has to be in an up state. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx-os/OTV/config_guide/b_Cisco_Nexus_7000_Series_NX-OS_OTV_Configuration_Guide/basic-otv.html 

Q490. Refer to the exhibit. 

You have configured two routing protocols across this point-to-point link. How many BFD sessions will be established across this link? 

A. three per interface 

B. one per multicast address 

C. one per routing protocol 

D. one per interface 



Cisco devices will use one Bidirectional Forwarding Detection (BFD) session for multiple client protocols in the Cisco implementation of BFD for Cisco IOS Releases 12.2(18)SXE, 12.0(31)S, and 12.4(4)T. For example, if a network is running OSPF and EIGRP across the same link to the same peer, only one BFD session will be established, and BFD will share session information with both routing protocols. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html#wp1053749 

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