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2021 Jul 400-101 ccie written exam price:

Q111. DRAG DROP 

Drag and drop the multicast protocol or feature on the left to the correct address space on the right. 


Answer: 



Q112. Which OSPF feature supports LSA rate limiting in milliseconds to provide faster convergence? 

A. LSA throttling 

B. incremental SPF 

C. fast hello 

D. SPF tuning 

Answer: A 

Explanation: 

The OSPF Link-State Advertisement (LSA) Throttling feature provides a dynamic mechanism to slow down link-state advertisement (LSA) updates in OSPF during times of network instability. It also allows faster Open Shortest Path First (OSPF) convergence by providing LSA rate limiting in milliseconds. 

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


Q113. Refer to the exhibit. 


You are bringing a new MPLS router online and have configured only what is shown to bring LDP up. Assume that the peer has been configured in a similar manner. You verify the LDP peer state and see that there are no neighbors. What will the output of show mpls ldp discovery show? 

A. Interfaces: 

Ethernet0/0 (ldp): xmit 

B. Interfaces: 

Ethernet0/0 (ldp): xmit/recv 

LDP Id: 25.25.25.2:0; IP addr: 192.168.12.2 

C. Interfaces: 

Ethernet0/0 (ldp): xmit/recv 

LDP Id: 192.168.12.2:0; no route 

D. Interfaces: 

Ethernet0/0 (ldp): xmit/recv 

LDP Id: 25.25.25.2:0; no route 

Answer: D 


Q114. Which two configuration changes should be made on the OTP interface of an EIGRP OTP route reflector? (Choose two.) 

A. passive-interface 

B. no split-horizon 

C. no next-hop-self 

D. hello-interval 60, hold-time 180 

Answer: B,C 

Explanation: 

The EIGRP Over the Top feature enables a single end-to-end Enhanced Interior Gateway Routing Protocol (EIGRP) routing domain that is transparent to the underlying public or private WAN transport that is used for connecting disparate EIGRP customer sites. When an enterprise extends its connectivity across multiple sites through a private or a public WAN connection, the service provider mandates that the enterprise use an additional routing protocol, typically the Border Gateway Protocol (BGP), over the WAN links to ensure end-to-end routing. The use of an additional protocol causes additional complexities for the enterprise, such as additional routing processes and sustained interaction between EIGRP and the routing protocol to ensure connectivity, for the enterprise. With the EIGRP Over the Top feature, routing is consolidated into a single protocol (EIGRP) across the WAN. 

Perform this task to configure a customer edge (CE) device in a network to function as an EIGRP Route Reflector: 

1. enable 

2. configure terminal 

3. router eigrp virtual-name 

4. address-family ipv4 unicast autonomous-system as-number 

5. af-interface interface-type interface-number 

6. no next-hop-self 

7. no split-horizon 

8. exit 

9. remote-neighbors source interface-type interface-number unicast-listen lisp-encap 

10. network ip-address 

11. end 

Note. Use no next-hop-self to instruct EIGRP to use the received next hop and not the local outbound interface address as the next hop to be advertised to neighboring devices. If no next-hop-self is not configured, the data traffic will flow through the EIGRP Route Reflector. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/ire-xe-3s-book/ire-eigrp-over-the-top.html 


Q115. Refer to the exhibit. 


Which statement about the R1 configuration is true? 

A. It supports the service timestamps log uptime command to display time stamps. 

B. The logging buffer command was used to increase the default of the buffer. 

C. The logging of warning messages is disabled. 

D. Log message sequence numbering is disabled. 

Answer: D 

Explanation: 

To disable sequence numbers, use the no service sequence-numbers global configuration command. 

This example shows part of a logging display with sequence numbers enableD. 000019: %SYS-5-CONFIG_I: Configured from console by vty2 (10.34.195.36) 

In this example we see the absence of sequence numbers on the log messages. 

Not A. In this example there are no time stamps or uptimes shown in the logs. 

Not B. The default buffer size is 4096 bytes. 

Not C. The logging level in this example is informational (level 6), which will display levels 0-6 in the logs. Warnings are level 4. 


400-101 actual test

Up to date 400-101 ccie routing and switching pdf:

Q116. Which two statements about Cisco Performance Routing are true? (Choose two.) 

A. It analyzes application performance to make routing decisions. 

B. When determining the best path, it prefers the shortest path. 

C. It can help the administrator determine the need for bandwidth upgrades. 

D. It operates entirely in the data plane. 

E. It can use EIGRP feasible successors to determine an alternate path. 

F. It analyzes system hardware performance to make routing decisions. 

Answer: A,E 


Q117. Refer to the exhibit. 


If you change the Spanning Tree Protocol from pvst to rapid-pvst, what is the effect on the interface Fa0/1 port state? 

A. It transitions to the listening state, and then the forwarding state. 

B. It transitions to the learning state and then the forwarding state. 

C. It transitions to the blocking state, then the learning state, and then the forwarding state. 

D. It transitions to the blocking state and then the forwarding state. 

Answer: C 

Explanation: 

First, the port will transition to the blocking state, immediately upon the change, then it will transition to the new RSTP states of learning and forwarding. 

Port States 

There are only three port states left in RSTP that correspond to the three possible operational states. The 802.1D disabled, blocking, and listening states are merged into a unique 802.1w discarding state. 

STP (802.1D) Port State 

RSTP (802.1w) Port State 

Is Port Included in Active Topology? 

Is Port Learning MAC Addresses? 

Disabled 

Discarding 

No 

No 

Blocking 

Discarding 

No 

No 

Listening 

Discarding 

Yes 

No 

Learning 

Learning 

Yes 

Yes 

Forwarding 

Forwarding 

Yes 

Yes 


Q118. Which two protocols does the Management Plane Protection feature support? (Choose two.) 

A. ARP 

B. HTTPS 

C. TFTP 

D. OSPF 

Answer: B,C 


Q119. Which IP SLA operation type uses IP to measure the round-trip time between a router and a device? 

A. HTTP 

B. ICMP Echo 

C. ICMP Path Jitter 

D. UDP Jitter for VoIP 

Answer: B 


Q120. If two OSPF type 3 prefixes have the same metric, and are within the same process, which prefix(es) are installed into the routing table? 

A. The route whose originator has the lower router ID. 

B. Both routes are installed. 

C. The route whose originator has the higher router ID. 

D. The first route that is learned. 

Answer: B 

Explanation: 

OSPF allows multiple equal-cost paths to the same destination. Since all link-state information is flooded and used in the SPF calculation, multiple equal cost paths can be computed and used for routing, and each route will be installed in the routing table.