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2021 Feb 400-101 ccie written exam price:

Q111. Which statement about OSPF multiaccess segments is true? 

A. The designated router is elected first. 

B. The designated and backup designated routers are elected at the same time. 

C. The router that sent the first hello message is elected first. 

D. The backup designated router is elected first. 

Answer: D 

Explanation: 

According to the RFC, the BDR is actually elected first, followed by the DR. The RFC explains why: “The reason behind the election algorithm’s complexity is the desire for an orderly transition from Backup Designated Router to Designated Router, when the current Designated Router fails. This orderly transition is ensured through the introduction of hysteresis: no new Backup Designated Router can be chosen until the old Backup accepts its new Designated Router responsibilities. The above procedure may elect the same router to be both Designated Router and Backup Designated Router, although that router will never be the calculating router (Router X) itself.” 

Reference: http://www.ietf.org/rfc/rfc2328.txt – Page 76 


Q112. Which two values are needed to configure NTP authentication? (Choose two.) 

A. the encryption method 

B. the key number 

C. the burst mode 

D. the key string 

E. the Diffie-Hellman group 

Answer: B,D 


Q113. DRAG DROP 

Drag and drop the NHRP flag on the left to the corresponding meaning on the right. 

Answer: 


Q114. Which service is disabled by the no service tcp-small-servers command? 

A. the finger service 

B. the Telnet service 

C. the Maintenance Operation Protocol service 

D. the chargen service 

Answer: D 

Explanation: 

The TCP small servers are: . Echo: Echoes back whatever you type through the telnet x.x.x.x echo command. 

. Chargen: Generates a stream of ASCII data. Use the telnet x.x.x.x chargen Command.

 . DiscarD. Throws away whatever you type. Use the telnet x.x.x.x discard command. 

. DaytimE. Returns system date and time, if it is correct. It is correct if you run Network Time Protocol (NTP), or have set the date and time manually from the exec level. Use the telnet x.x.x.x daytime command. 

Reference: http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-software-releases-110/12815-23.html 


Q115. Which two tasks are required for configuring SNMP to send traps on a Cisco IOS device? (Choose two.) 

A. Create access controls for an SNMP community. 

B. Configure SNMP notifications. 

C. Configure the SNMP agent. 

D. Configure SNMP status monitoring and troubleshooting. 

E. Configure SNMP server group names. 

F. Configure the SNMP server engine ID. 

Answer: A,B 

Explanation: 

The best current practices recommend applying Access Control Lists (ACLs) to community strings and ensuring that the requests community strings are not identical to notifications community strings. Access lists provide further protection when used in combination with other protective measures. This example sets up ACL to community string: 

access-list 1 permit 1.1.1.1 snmp-server community string1 ro 1 

. SNMP Notifications 

A key feature of SNMP is the ability to generate notifications from an SNMP agent. These notifications do not require that requests be sent from the SNMP manager. Unsolicited (asynchronous) notifications can be generated as traps or inform requests. Traps are messages alerting the SNMP manager to a condition on the network. Inform requests (informs) are traps that include a request for confirmation of receipt from the SNMP manager. Notifications can indicate improper user authentication, restarts, the closing of a connection, loss of connection to a neighbor router, or other significant events. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/configuration/guide/ffun_c/fcf014.h tml#wp1007320 


Renewal 400-101 ccie routing and switching pdf:

Q116. What is the function of an implicit-null label? 

A. It notifies the upstream LSR to remove the top label in the label stack and forward the packet. 

B. It notifies the upstream LSR to add a VPN label to the label stack. 

C. It is used to statically assign a label to an IGP route. 

D. It is used to identify the router ID. 

Answer: A 


Q117. Which two statements about OSPF are true? (Choose two.) 

A. External type 2 routes are preferred over interarea routes. 

B. Intra-area routes are preferred over interarea routes. 

C. External type 1 routes are preferred over external type 2 routes. 

D. External type 1 routes are preferred over intra-area routes. 

E. External type 2 routes are preferred over external type 1 routes. 

Answer: B,C 


Q118. Refer to the exhibit. 

Which two statements about this egress queue are true? (Choose two.) 

A. The queue 3 buffer is allocated 20 percent, its drop threshold is 100 percent, and it is guaranteed 400 percent of memory. 

B. The queue 1 buffer is allocated 30 percent, its drop threshold is 25 percent, and it is guaranteed 100 percent of memory. 

C. The queue 1 buffer is allocated 30 percent, its drop threshold is 100 percent, and it is guaranteed 150 percent of memory. 

D. The queue 2 buffer is allocated 30 percent, its drop threshold is 200 percent, and it can use at maximum 400 percent of memory. 

E. The queue 3 buffer is allocated 30 percent, its drop threshold is 100 percent, and it can use at maximum 400 percent of memory. 

Answer: B,D 


Q119. Refer to the exhibit. 

Which LISP component do routers in the public IP network use to forward traffic between the two networks? 

A. EID 

B. RLOC 

C. map server 

D. map resolver 

Answer: B 

Explanation: 

Locator ID Separation Protocol (LISP) is a network architecture and protocol that implements the use of two namespaces instead of a single IP address: 

. Endpoint identifiers (EIDs)—assigned to end hosts. 

. Routing locators (RLOCs)—assigned to devices (primarily routers) that make up the global routing system. The public networks use the RLOC to forward traffic between networks. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/15-mt/irl-15-mt-book/irl-overview.html 


Q120. Refer to the exhibit. 

Which statement about the topology is true? 

A. It provides a transparent LAN service. 

B. It provides only point-to-multipoint connections between UNIs. 

C. It uses port-based connections at the hub. 

D. It provides point-to-point connections between UNIs. 

Answer: D