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2016 Nov 400-101 ccie routing and switching pdf:

Q71. Refer to the exhibit. 

R1 and R2 both advertise to R3 and R4 as shown. R1 is the primary path. Which path does traffic take from the R4 data center to the file server? 

A. All traffic travels from R4 to R2 to the file server. 

B. All traffic travels from R4 to R3 to R1 to the file server. 

C. Traffic is load-balanced from R4 to R2 and R3. Traffic that is directed to R3 then continues to R1 to the file server. Traffic that is directed to R2 continues to the file server. 

D. All traffic travels from R4 to R2 to R1 to the file server. 



Drag and drop the argument of the mpls ip cef load-sharing command on the left to the function it performs on the right. 


Q73. Which three statements about Cisco HDLC are true? (Choose three.) 

A. HDLC serial encapsulation provides asynchronous framing and error detection. 

B. Serial link keepalives are maintained by SLARP. 

C. HDLC serial encapsulation provides synchronous framing without retransmission. 

D. HDLC frame size can be reduced with MPPC compression. 

E. The interface is brought down after five ignored keepalives. 

F. The interface is brought down after three ignored keepalives. 

Answer: B,C,F 


Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. For each encapsulation type, a certain number of keepalives ignored by a peer triggers the serial interface to transition to the down state. For HDLC encapsulation, three ignored keepalives causes the interface to be brought down. By default, synchronous serial lines use the High-Level Data Link Control (HDLC) serial encapsulation method, which provides the synchronous framing and error detection functions of HDLC without windowing or retransmission. 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/ 819_SCG/6ser_conf.html#78662 

Q74. Which three statements about EIGRP wide metrics are true? (Choose three.) 

A. The maximum metric is 65536. 

B. The default delay is 1,000,000 picoseconds. 

C. They allow up to 100 hops. 

D. They allow up to 256 hops. 

E. The default delay is 1,000,000 milliseconds. 

F. The maximum metric is 51200. 

Answer: A,B,C 

Q75. Refer to the exhibit. 

You are configuring the S1 switch for the switchport connecting to the client computer. Which option describes the effect of the command mls qos map cos-dscp 0 8 16 24 32 40 46 56? 

A. Voice traffic is excluded from the default priority queue. 

B. Voice packets are given a class selector of 5. 

C. Video conferencing is marked CS3. 

D. Voice packets are processed in the priority queue. 



The default CoS to DSCP mappings are shown below: 

Default CoS-to-DSCP Map 

CoS Value 

DSCP Value 







In our example, we see that COS 6 is mapped to DSCP, not the default of DSCP 48 as shown above. DSCP 46 is Expedited Forwarding (EF), which is typically used for voice traffic, and this value has not been included in this class map. 

Down to date 400-101 ccie routing and switching written exam fee:

Q76. Which three factors does Cisco PfR use to calculate the best exit path? (Choose three.) 

A. quality of service 

B. packet size 

C. delay 

D. loss 

E. reachability 

F. administrative distance 

Answer: C,D,E 


Cisco PfR selects an egress or ingress WAN path based on parameters that affect application performance, including reachability, delay, cost, jitter, and Mean Opinion Score (MOS). 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/performance-routing-pfr/product_data_sheet0900aecd806c4ee4.html 

Q77. Which statement about the spanning-tree portfast feature on the switch is true? 

A. If an interface is enabled for portfast receives BDPU, the port goes through the spanning-tree listening, learning, and forwarding states. 

B. If an interface is enabled for portfast receives BDPU, the port does not go through the spanning-tree listening, learning, and forwarding states. 

C. If an interface is enabled for portfast receives BDPU, the port is shut down immediately. 

D. If an interface is enabled for portfast receives BDPU, the port goes into the spanning-tree inconsistent state. 


Q78. What are three required commands when you enable source-specific multicast for addresses in the range (Choose three.) 

A. ip multicast-routing 

B. ip igmp version 3 

C. ip pim ssm-range 

D. ip igmp version 2 

E. ip pim ssm-range default 

F. set routing-options multicast ssm-groups 

Answer: A,B,C 

Q79. Which option is the default maximum age of the MAC address table? 

A. 300 seconds 

B. 500 seconds 

C. 1200 seconds 

D. 3600 seconds 



To configure the maximum aging time for entries in the Layer 2 table, use the mac-address-table aging-time command in global configuration mode. 

Syntax Description 


MAC address table entry maximum age. Valid values are 0, and from 5 to 1000000 seconds. Aging time is counted from the last time that the switch detected the MAC address. The default value is 300 seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/lanswitch/command/reference/lsw_book/lsw_m1. html 

Q80. Refer to the exhibit. 

Which statement is true? 

A. R1 routes this pseudowire over MPLS TE tunnel 1 with transport label 20. 

B. The default route is available in the IPv4 routing table. 

C. R1 is using an MPLS TE tunnel for this pseudowire, because the IP path is not available. 

D. R1 has preferred-path configured for the pseudowire. 



Verifying the Configuration: Example In the following example, the show mpls l2transport vc command shows the following information (in bold) about the VCs: 

. VC 101 has been assigned a preferred path called Tunnel1. The default path is disabled because the preferred path specified that the default path should not be used if the preferred path fails. 

. VC 150 has been assigned an IP address of a loopback address on PE2. The default path can be used if the preferred path fails. 

Router# show mpls l2transport vc detail 

Local interface. Gi0/0/0.1 up, line protocol up, Eth VLAN 222 up 

Destination address:, VC ID. 101, VC status: up 

Preferred path: Tunnel1, active 

Default path: disabled

Tunnel label: 3, next hop point2point 

Output interfacE. Tu1, imposed label stack {17 16} 

Create timE. 00:27:31, last status change timE. 00:27:31 

Signaling protocol: LDP, peer up 

MPLS VC labels: local 25, remote 16 

Group ID. local 0, remote 6 

MTU: local 1500, remote 1500 

Remote interface description: 

Sequencing: receive disabled, send disabled 

VC statistics: 

packet totals: receive 10, send 10 

byte totals: receive 1260, send 1300 

packet drops: receive 0, send 0 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srtunsel.html#wp10 57815