Cisco 400-101 ExamCCIE Routing and Switching (v5.0)

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Q411. A network engineer is extending a LAN segment between two geographically separated data centers. Which enhancement to a spanning-tree design prevents unnecessary traffic from crossing the extended LAN segment? 

A. Modify the spanning-tree priorities to dictate the traffic flow. 

B. Create a Layer 3 transit VLAN to segment the traffic between the sites. 

C. Use VTP pruning on the trunk interfaces. 

D. Configure manual trunk pruning between the two locations. 

Answer:


Q412. A configuration includes the line ip route 10.0.0.0 255.0.0.0 172.16.10.10 permanent. 

Which option is a benefit of configuring this static route as permanent? 

A. It allows the route to be redistributed into the network even if the outgoing interface is down. 

B. It allows the route to be saved in the running configuration of the device. 

C. It places a hidden tag on the route that can be matched on other devices. 

D. It allows the route to have a tracking status even if no tracking object is configured. 

Answer:


Q413. Refer to the exhibit. 

Which configuration must you apply to router R2 to enable BFD?

A) 

B) 

C) 

D) 

A. Exhibit A 

B. Exhibit B 

C. Exhibit C 

D. Exhibit D 

Answer:


Q414. Refer to the exhibit. 

Which type of BGP peer is 192.168.1.1? 

A. route reflector client 

B. iBGP 

C. confederation 

D. VPNv4 

Answer:


Q415. What is the destination multicast MAC address for BPDUs on the native VLAN, for a switch that is running 802.1D? 

A. 0185. C400. 0000 

B. 0100.0CCC.CCCC 

C. 0100.0CCC.CCCD 

D. 0180.C200.0000 

Answer:

Explanation: 

If the native vlan is 1: 

A STP BPDU for VLAN 1 will be sent untagged to MAC 0180.c200.0000 (this is the 

common spanning tree) 

A PVST+ BPDU for VLAN 1 will be sent untagged to MAC 0100.0ccc.cccd 

A PVST+ BPDU for all other vlans will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd 

(with a PVID = to the VLAN) 

If the native vlan is not 1: 

A STP BPDU for VLAN 1 will be sent untagged (on the native vlan) to MAC 

0180.c200.0000 (this is the common spanning tree) 

A PVST+ BPDU for VLAN1 will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd (with a PVID=1) 

A PVST+ BPDU for the native vlan will be sent untagged to MAC 0100.0ccc.cccd (with a PVID=native vlan) 

A PVST+ BPDU for all other vlans will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd (with a PVID = to the VLAN) 


Q416. In the DiffServ model, which class represents the lowest priority with the highest drop probability? 

A. AF11 

B. AF13 

C. AF41 

D. AF43 

Answer:

Explanation: 

Assured Forwarding (AF) Behavior Group 

Class 1 

Class 2 

Class 3 

Class 4 

Low Drop 

AF11 (DSCP 10) 

AF21 (DSCP 18) 

AF31 (DSCP 26) 

AF41 (DSCP 34) 

Med Drop 

AF12 (DSCP 12) 

AF22 (DSCP 20) 

AF32 (DSCP 28) 

AF42 (DSCP 36) 

High Drop 

AF13 (DSCP 14) 

AF23 (DSCP 22) 

AF33 (DSCP 30) 

AF43 (DSCP 38) 

Reference: http://en.wikipedia.org/wiki/Differentiated_services 


Q417. Which two statements about class maps are true? (Choose two.) 

A. As many as eight DSCP values can be included in a match dscp statement. 

B. The default parameter on a class map with more than one match command is match-any. 

C. The match class command can nest a class map within another class map. 

D. A policy map can be used to designate a protocol within a class map. 

Answer: A,C 

Explanation: 

Answer A. 

Router(config-cmap)# match [ip] dscp dscp-value [dscp-value dscp-value dscp-value 

dscp-value dscp-value dscp-value dscp-value] 

(Optional) Identifies a specific IP differentiated service code point (DSCP) value as a match criterion. Up to eight DSCP values can be included in one match statement. 

Answer C. 

Router config-cmap)# match class-map class-name (Optional) Specifies the name of a traffic class to be used as a matching criterion (for nesting traffic class [nested class maps] within one another). 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcfmcli2.html 


Q418. Which attribute is not part of the BGP extended community when a PE creates a VPN-IPv4 route while running OSPF between PE-CE? 

A. OSPF domain identifier 

B. OSPF route type 

C. OSPF router ID 

D. MED 

E. OSPF network type 

Answer:

Explanation: 

By process of elimination, from RFC 4577: 

For every address prefix that was installed in the VRF by one of its associated OSPF instances, the PE must create a VPN-IPv4 route in BGP. Each such route will have some of the following Extended Communities attributes: 

– The OSPF Domain Identifier Extended Communities attribute. If the OSPF instance that installed the route has a non-NULL primary Domain Identifier, this MUST be present; if that OSPF instance has only a NULL Domain Identifier, it MAY be omitted. 

– OSPF Route Type Extended Communities Attribute. This attribute MUST be present. It is encoded with a two-byte type field, and its type is 0306. 

– OSPF Router ID Extended Communities Attribute. This OPTIONAL attribute specifies the OSPF Router ID of the system that is identified in the BGP Next Hop attribute. More precisely, it specifies the OSPF Router Id of the PE in the OSPF instance that installed the route into the VRF from which this route was exported. 

– MED (Multi_EXIT_DISC attribute). By default, this SHOULD be set to the value of the OSPF distance associated with the route, plus 1. 

Reference: https://tools.ietf.org/html/rfc4577 


Q419. 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:

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 


Q420. Refer to the exhibit. 

Routers R1, R2, and R3 are configured as shown, and traffic from R2 fails to reach 172.29.168.3. 

Which action can you take to correct the problem? 

A. Correct the static route on R1. 

B. Correct the default route on R2. 

C. Edit the EIGRP configuration of R3 to enable auto-summary. 

D. Correct the network statement for 172.29.168.3 on R3. 

Answer:

Explanation: 

On R1 we see there is a wrongly configured static route: ip route 172.29.168.3 255.255.255.255 172.17.17.2. It should be ip route 172.29.168.3 255.255.255.255 10.17.12.3. 


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