Exam Code: 400-101 (Practice Exam Latest Test Questions VCE PDF)
Exam Name: CCIE Routing and Switching (v5.0)
Certification Provider: Cisco
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2017 Apr 400-101 practice


Drag and drop each description of IPv6 transition technology on the left to the matching IPv6 transition technology category on the right. 


Q252. Which technology facilitates dynamic tunnel establishment in DMVPN? 


B. mGRE 

C. a dynamic routing protocol 



Q253. With AutoInstall, which mechanism allows for automatic addressing of the serial interface using HDLC? 






Q254. Which three statements about bridge assurance are true? (Choose three.) 

A. Bridge assurance must be enabled on both ends of a link. 

B. Bridge assurance can be enabled on one end of a link or on both ends. 

C. Bridge assurance is enabled on STP point-to-point links only. 

D. Bridge assurance is enabled on STP multipoint links only. 

E. If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into a blocking state. 

F. If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into an error disabled state. 

Answer: A,C,E 


Bridge Assurance is enabled by default and can only be disabled globally. Also, Bridge Assurance can be enabled only on spanning tree network ports that are point-to-point links. 

Finally, both ends of the link must have Bridge Assurance enabled. 

With Bridge Assurance enabled, BPDUs are sent out on all operational network ports, including alternate and backup ports, for each hello time period. If the port does not receive a BPDU for a specified period, the port moves into the blocking state and is not used in the root port calculation. Once that port receives a BPDU, it resumes the normal spanning tree transitions. 


http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guid e/cli/CLIConfigurationGuide/SpanningEnhanced.html 

Q255. Which two options are valid for the number of bytes in a BGP AS number? (Choose two.) 

A. 2 bytes 

B. 4 bytes 

C. 6 bytes 

D. 8 bytes 

E. 16 bytes 

Answer: A,B 


During the early time of BGP development and standardization, it was assumed that availability of a 16 bit binary number to identify the Autonomous System (AS) within BGP would have been more than sufficient. The 16 bit AS number, also known as the 2-byte AS number, provides a pool of 65536 unique Autonomous System numbers. The IANA manages the available BGP Autonomous System Numbers (ASN) pool, with the assignments being carried out by the Regional Registries. The current consumption rate of the publicly available AS numbers suggests that the entire public 2-byte ASN pool will be fully depleted. A solution to this depletion is the expansion of the existing 2-byte AS number to a 4-byte AS number, which provides a theoretical 4,294,967,296 unique AS numbers. ARIN has made the following policy changes in conjunction with the adoption of the solution. The Cisco IOS BGP "4-byte ASN" feature allows BGP to carry a Autonomous System Number (ASN) encoded as a 4-byte entity. The addition of this feature allows an operator to use an expanded 4-byte AS number granted by IANA. 

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Q256. Refer to the exhibit. 

Which two statements are true about the displayed STP state? (Choose two.) 

A. The STP version configured on the switch is IEEE 802.1w. 

B. Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago. 

C. The switch does not have PortFast configured on Gi0/15. 

D. BPDUs with the TCN bit set are transmitted over port channel 1. 

Answer: C,D 


A port enabled with portfast will not send topology changes when a port goes up or down, but here we see that 296 TCN’s were sent so we know that Gi 0/15 does not have portfast enabled. 

TCN’s are sent using BPDU’s over the root port, which we see is port channel 1. 

Q257. Which Cisco IOS XE process administers routing and forwarding? 

A. Forwarding manager 

B. Interface manager 

C. Cisco IOS 

D. Host manager 



Some of the processes are listed in the table below: 



Affected FRUs 

SubPackage Mapping 

Host Manager 

Provides an interface between the IOS process and many of the information-gathering functions of the underlying platform kernel and operating system. 

RP (one instance per RP) 

SIP (one instance per SIP) 

ESP (one instance per ESP) 




Interface Manager 

Provides an interface between the IOS process and the per-SPA interface processes on the SIP. 

RP (one instance per RP) 

SIP (one instance per SIP) 




The IOS process implements all forwarding and routing features for the router. 

RP (one per software redundancy instance per RP). Maximum of two instances per RP. 


Forwarding Manager 

Manages the downloading of configuration to each of the ESPs and the communication of forwarding plane information, such as statistics, to the IOS process. 

RP (one per software redundancy instance per RP). Maximum of two instances per RP. 

ESP (one per ESP) 



Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/chassis/asrswcfg /Software_Packaging_Architecture.html 

Q258. Refer to the exhibit. 

Which AS paths are matched by this access list? 

A. the origin AS 64496 only 

B. the origin AS 64496 and any ASs after AS 64496 

C. the directly attached AS 64496 and any ASs directly attached to AS 64496 

D. the directly attached AS 64496 and any longer AS paths 



If you want AS 1 to get networks originated from AS 4 and all directly attached ASs of AS 4, apply the following inbound filter on Router 1. ip as-path access-list 1 permit ^4_[0-9]*$ router bgp 1 neighbor remote-as 4 neighbor route-map foo in route-map foo permit 10 match as-path 1 In the ip as-path access-list command, the carat (^) starts the input string and designates "AS". The underscore (_) means there is a a null string in the string that follows "AS 4". The [0-9]* specifies that any connected AS with a valid AS number can pass the filter. The advantage of using the [0-9]* syntax is that it gives you the flexibility to add any number of ASs without modifying this command string. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13754-26.html 

Q259. On an MPLS L3VPN, which two tasks are performed by the PE router? (Choose two.) 

A. It exchanges VPNv4 routes with other PE routers. 

B. It typically exchanges iBGP routing updates with the CE device. 

C. It distributes labels and forwards labeled packets. 

D. It exchanges VPNv4 routes with CE devices. 

E. It forwards labeled packets between CE devices. 

Answer: A,C 


MPLS VPN functionality is enabled at the edge of an MPLS network. The PE router performs these tasks: . 

Exchanges routing updates with the CE router . 

Translates the CE routing information into VPN version 4 (VPNv4) routes . 

Exchanges VPNv4 routes with other PE routers through the Multiprotocol Border Gateway Protocol (MP-BGP) 

A PE router binds a label to each customer prefix learned from a CE router and includes the label in the network reachability information for the prefix that it advertises to other PE routers. When a PE router forwards a packet received from a CE router across the provider network, it labels the packet with the label learned from the destination PE router. When the destination PE router receives the labeled packet, it pops the label and uses it to direct the packet to the correct CE router. Label forwarding across the provider backbone is based on either dynamic label switching or traffic engineered paths. A customer data packet carries two levels of labels when traversing the backbone 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-2/lxvpn/configuration/guide/vcasr9kv342/vcasr9k42v3.html 


Drag and drop the NetFlow Export feature on the left to the NetFlow version that first supported it on the right.