[Free] February 2017(Feb) Ensurepass Examcollection Cisco 400-101 Practice Test 631-640

Ensurepass

CCIE Routing and Switching Written Exam v5.1

 

QUESTION 631

In an STP domain, which two statements are true for a nonroot switch, when it receives a configuration BPDU from the root bridge with the TC bit set? (Choose two.)

 

A.

It sets the MAC table aging time to max_age + forward_delay time.

B.

It sets the MAC table aging time to forward_delay time.

C.

It recalculates the STP topology upon receiving topology change notification from the root switch.

D.

It receives the topology change BPDU on both forwarding and blocking ports.

 

Correct Answer: BD

Explanation:

When the TC bit is received, Every bridge is then notified and reduces the aging time to forward_delay (15 seconds by default) for a certain period of time (max_age + forward_delay). It is more beneficial to reduce the aging time instead of clearing the table because currently active hosts, that effectively transmit traffic, are not cleared from the table.

Once the root is aware that there has been a topology change event in the network, it starts to send out its configuration BPDUs with the topology change (TC) bit set. These BPDUs are relayed

by every bridge in the network with this bit set. As a result all bridges become aware of the topology change situation and it can reduce its aging time to forward_delay. Bridges receive topology change BPDUs on both forwarding and blocking ports.

An important point to consider here is that a TCN does not start a STP recalculation. This fear comes from the fact that TCNs are often associated with unstable STP environments; TCNs are a consequence of this, not a cause. The TCN only has an impact on the aging time. It does not change the topology nor create a loop.

Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-treeprotocol/12013-17.html#topic1

 

 

QUESTION 632

Which command sets the maximum segment size for a TCP packet initiated from a router?

 

A.

ip mtu

B.

ip tcp adjust-mss

C.

ip tcp mss

D.

ip tcp window-size

 

Correct Answer: C

 

 

QUESTION 633

Which three routing protocols utilize TLVs? (Choose three.)

 

A.

BGP

B.

IS-IS

C.

ODR

D.

OSPF

E.

EIGRP

F.

RIP

 

Correct Answer: ABE

Explanation:

IS-IS, originally designed for Open System Interconnection (OSI) routing, uses TLV parameters to carry information in Link State Packets (LSPs). The TLVs make IS-IS extendable. IS-IS can

therefore carry different kinds of information in the LSPs.

Several routing protocols use TLVs to carry a variety of attributes. Cisco Discovery Protocol (CDP), Label Discovery Protocol (LDP), and Border Gateway Protocol (BGP) are examples of protocols that use TLVs. BGP uses TLVs to carry attributes such as Network Layer Reachability Information (NLRI), Multiple Exit Discriminator (MED), and local preference.

The IP header of the EIGRP packet specifies IP protocol number 88 within it, and the maximum length of the packet will be the IP MTU of the interface on which it is transmitted, most of the time 1500 octets. Following the IP header is the various Type/Length/Value (TLV) triplets. These TLVs will not only carry the route entries but also provide fields for the management of the DUAL

process, multicast sequencing, and IOS software versions from the router.

References:

http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-tointermediate-system-is-is/5739-tlvs-5739.html

http://ericleahy.com/index.php/eigrp-packets-neighborships/

 

 

QUESTION 634

With AutoInstall, which mechanism all
ows for automatic addressing of the serial interface using HDLC?

 

A.

ARP

B.

BOOTP

C.

DHCP

D.

SLARP

 

Correct Answer: D

 

 

QUESTION 635

Refer to the exhibit. Which BGP feature allows R1 to send R2 a list of prefixes that R2 is prevented from advertising to R1?

 

clip_image002

 

A.

route refresh

B.

Prefix-Based Outbound Route Filtering

C.

distribute lists

D.

prefix lists

 

Correct Answer: B

 

 

QUESTION 636

Which three statements about the differences between Cisco IOS and IOS-XE functionality are true? (Choose three.)

 

A.

Only IOS-XE Software can host applications outside of the IOS context.

B.

Only the IOS-XE Services Plane has multiple cores.

C.

Only the IOS-XE Data Plane has multiple cores.

D.

Only the IOS-XE Control Plane has multiple cores.

E.

Only IOS-XE module management integrates with packet processing.

F.

Only IOS-XE configuration and control is integrated with the kernel.

 

Correct Answer: ABC

 

 

 

 

QUESTION 637

Refer to the exhibit. Why is the loopback 0 interface of R4 missing in the routing table of R2?

 

clip_image004

 

A.

R2 is configured as a route reflector client.

B.

There is no peering between R2 and R3.

C.

The next hop is not reachable from R2.

D.

The route originated within the same AS.

 

Correct Answer: B

Explanation:

In the “show ip bgp” output we see that there is no peering session between R2 and R3. Since R3 is the route reflector here, R3 would reflect routes advertised from R4 to R2, but the peer needs to be established first.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 638

DRAG DROP

Drag and drop the DSCP PHB on the left to the corresponding binary representation on the right.

 

clip_image006

 

Correct Answer:

clip_image008

 

 

QUESTION 639

Which technology can create a filter for an embedded packet capture?

 

A.

Control plane policing

B.

Access lists

C.

NBAR

D.

Traffic shaping

 

Correct Answer: B

Explanation:

A filter can be applied to limit the capture to desired traffic. Define an Access Control List (ACL) within config mode and apply the filter to the buffer:

 

ip access-list extended BUF-FILTER

permit ip host 192.168.1.1 host 172.16.1.1

permit ip host 172.16.1.1 host 192.168.1.1

monitor capture buffer BUF filter access-list BUF-FILTER

 

Reference: http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-embedded-packet-capture/116045-productconfig-epc-00.html

 

 

QUESTION 640

Which two statements about HSRP are true? (Choose two.)

 

A.

Its virtual MAC is 0000.0C07.Acxx.

B.

Its multicast virtual MAC is 0000.5E00.01xx.

C.

Its default configuration allows for pre-emption.

D.

It supports tracking.

E.

It supports unique virtual MAC addresses.

 

Correct Answer: AD

Explanation:

Default HSRP Configuration

Feature

Default Setting

HSRP version

Version 1

HSRP groups

None configured

Standby group number

0

Standby MAC address

System assigned as: 0000.0c07.acXX, where XX is the HSRP group number

Standby priority

100

Standby delay

0 (no delay)

Standby track interface priority

10

Standby hello time

3 seconds

Standby holdtime

10 seconds

The standby track interface configuration command ties the router hot standby priority to the availability of its interfaces and is useful for tracking interfaces that are not configured for HSRP. When a tracked interface fails, the hot standby priority on the device on which tracking has been configured decreases by 10. If an interface is not tracked, its state changes do not affect the hot standby priority of the configured device. For each interface configured for hot standby, you can configure a separate list of interfaces to be tracked.

The standby track interface-priority interface configuration command specifies how much to decrement the hot standby priority when a tracked interface goes down. When the interface comes back up, the priority is incremented by the same amount.

 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swhsrp.html

 

Free VCE & PDF File for Cisco 400-101 Practice Test

Instant Access to Free VCE Files: CCNA | CCNP | CCIE …
Instant Access to Free PDF Files: CCNA | CCNP | CCIE …