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2017 Mar 400-101 Study Guide Questions:

Q141. Which two statements best describes the difference between active mode monitoring and passive mode monitoring? (Choose two.) 

A. Active mode monitoring is the act of Cisco PfR gathering information on user packets assembled into flows by NetFlow. 

B. Active mode monitoring uses IP SLA probes for obtaining performance characteristics of the current exit WAN link. 

C. Passive mode monitoring uses IP SLA to generate probes for the purpose of obtaining information regarding the characteristics of the WAN links. 

D. Passive mode monitoring uses NetFlow for obtaining performance characteristics of the exit WAN links. 

Answer: B,D 

Q142. DRAG DROP 

Drag and drop the IPv6 multicast feature or protocol on the left to the correct address space on the right. 

Answer: 

Q143. Which three TLVs does LLDP use to discover network devices? (Choose three.) 

A. Management address 

B. Port description 

C. Network policy 

D. System name 

E. Location information 

F. Power management 

Answer: A,B,D 

Explanation: 

Basic Management TLV Set 

This set includes the following five TLVs used in LLDP: 

. Port description TLV: Provides a description of the port in an alpha-numeric format. The value equals the ifDescr object, if the LAN device supports RFC 2863. 

. System name TLV: Provides the system's assigned name in an alpha-numeric format. The value equals the sysName object, if the LAN device supports RFC 3418. 

. System description TLV: Provides a description of the network entity in an alpha-numeric format. This includes system's name and versions of hardware, operating system and networking software supported in the device. The value equals the sysDescr object, if the LAN device supports RFC 3418. 

. System capabilities TLV: Indicates the primary function(s) of the device and whether or not these functions are enabled in the device. The capabilities are indicated by two octects. Bits 0 through 7 indicate Other, Repeater, Bridge, WLAN AP, Router, Telephone, DOCSIS cable device and Station respectively. Bits 8 through 15 are reserved. 

. Management address TLV: Indicates the addresses of the local LLDP agent. Other remote managers can use this address to obtain information related to the local device. 

Reference: http://www.eetimes.com/document.asp?doc_id=1272069 

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Q144. What is the preferred method to improve neighbor loss detection in EIGRP? 

A. EIGRP natively detects neighbor down immediately, and no additional feature or configuration is required. 

B. BFD should be used on interfaces that support it for rapid neighbor loss detection. 

C. Fast hellos (subsecond) are preferred for EIGRP, so that it learns rapidly through its own mechanisms. 

D. Fast hellos (one-second hellos) are preferred for EIGRP, so that it learns rapidly through its own mechanisms. 

Answer: B 

Explanation: 

Bi-directional Forwarding Detection (BFD) provides rapid failure detection times between forwarding engines, while maintaining low overhead. It also provides a single, standardized method of link/device/protocol failure detection at any protocol layer and over any media. 

Reference: “Bidirectional Forwarding Detection for EIGRP” 

http://www.cisco.com/en/US/technologies/tk648/tk365/tk207/technologies_white_paper090 0aecd80243fe7.html 

Q145. Which option describes what the default RT filter indicates when you implement the BGP RT constrained route distribution feature? 

A. A peer receives only a default route for each VRF. 

B. A peer receives all routes, regardless of the RT value. 

C. A peer receives routes only for RTs that are used on that router. 

D. A peer receives no routes, regardless of the RT value. 

Answer: B 

Q146. Which two hashing algorithms can be used when configuring SNMPv3? (Choose two.) 

A. MD5 

B. SHA-1 

C. Blowfish 

D. DES 

E. AES 

F. SSL 

Answer: A,B 

Explanation: 

Note that SNMPv3 does not send passwords in clear-text and uses hash-based authentication with either MD5 or SHA1 functions (HMAC authentication – the packet conted is hashed along with authentication key to produce the authentication string). 

Reference: http://blog.ine.com/2008/07/19/snmpv3-tutorial/ 

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Q147. Refer to the exhibit. 

Which two actions can you take to enable CE-1 at site A to access the Internet? (Choose two.) 

A. Create a default route for site A on PE-1 with the next hop set to the PE-2 interface to the Internet. 

B. Originate a default route in site B with the next hop set to the PE-2 Internet interface, and import the default route into site A. 

C. Create a default route on CE-1 with the next hop set to the PE-1 upstream interface. 

D. Originate a default route in site A with the next hop set to the PE-2 interface to CE-1. 

E. Create a static default route on CE-1 with the next hop set to the PE-2 interface to the Internet. 

Answer: A,B 

Q148. 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 

Q149. 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 

Q150. Which two statements about the command distance bgp 90 60 120 are true? (Choose two.) 

A. Implementing the command is a Cisco best practice. 

B. The external distance it sets is preferred over the internal distance. 

C. The internal distance it sets is preferred over the external distance. 

D. The local distance it sets may conflict with the EIGRP administrative distance. 

E. The internal distance it sets may conflict with the EIGRP administrative distance. 

F. The local distance it sets may conflict with the RIP administrative distance. 

Answer: C,F 

Explanation: 

To allow the use of external, internal, and local administrative distances that could be a better route than other external, internal, or local routes to a node, use the distance bgp command in address family or router configuration mode. To return to the default values, use the no form of this command. distance bgp external-distance internal-distance local-distance no distance bgp 

. Syntax Description 

external-distance 

Administrative distance for BGP external routes. External routes are routes for which the best path is learned from a neighbor external to the autonomous system. Accept table values are from 1 to 255. The default is 20. Routes with a distance of 255 are not installed in the routing table. 

internal-distance 

Administrative distance for BGP internal routes. Internal routes are those routes that are learned from another BGP entity within the same autonomous system. Accept table values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table. 

local-distance 

Administrative distance for BGP local routes. Local routes are those networks listed with a network router configuration command, often as back doors, for that router or for networks that are being redistributed from another process. Accept table values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table. 

Defaults 

external-distance: 20 

internal-distance: 200 

local-distance: 200 

In this case, the internal distance is 60 and the external is 90, and the local distance is 120 (same as RIP). 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfbgp1. html#wp1113874 

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