Ensurepass
2017 July Cisco Official New Released 400-101 Q&As
100% Free Download! 100% Pass Guaranteed!
http://www.ensurepass.com/400-101.html

CCIE Routing and Switching Written Exam v5.1

QUESTION 391

Refer to the exhibit. R3 is failing to join the multicast group 224.1.1.1 that is sourcing from R1. Which two actions can you take to allow multicast traffic to flow correctly? (Choose two.)

 

clip_image002

 

A.

Remove the static multicast route on R1.

B.

Configure OSPF on R1 and R3 to include the tunnel interfaces.

C.

Add an additional static multicast route on R2 for multicast group 224.1.1.1 toward R3.

D.

Replace the static multicast route on R1 to send traffic toward R2.

E.

Remove the static unicast route on R1.

F.

Add an additional static unicast route on R2 toward the loopback interface of R3.

 

Correct Answer: AB

Explanation:

Since the tunnel interfaces are not part of OSPF, the best path to the multicast source of R1 from R3 would be over the Gi0/0 path via OSPF. However, the static mroute is configured to use the tunnel, so this causes an RPF failure used in Sparse Mode. Best fix is to add the tunnel interfaces into OSPF and remove the static mroute so that that the RPF check no longer fails.

QUESTION 392

DRAG DROP

Drag and drop the IGMPv2 timer on the left to its default value on the right.

 

clip_image004

 

Correct Answer:

clip_image006

 

 

QUESTION 393

Which two statements about RSTP and MSTP BPDUs are true? (Choose two.)

 

A.

MSTP switches can detect boundary ports when they receive RSTP version 2 BPDUs.

B.

MSTP switches can detect boundary ports when they receive RSTP version 1 BPDUs.

C.

RSTP switches can process MSTP version 3 BPDUs.

D.

When all boundary switches are running RSTP, MST sends only version 0 configuration BPDUs.

 

Correct Answer: AC

Explanation:

A switch running both MSTP and RSTP supports a built-in protocol migration mechanism that enables it to interoperate with legacy 802.1D switches. If this switch receives a legacy 802.1D configuration BPDU (a BPDU with the protocol version set to 0), it sends only 802.1D BPDUs on that port. An MST switch can also detect that a port is at the boundary of a region when it receives a legacy BPDU, an MST BPDU (version 3) associated with a different region, or an RST BPDU (version 2).

Refere
nce: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_9_ea1/configuration/guide/scg/swmstp.html

 

 

QUESTION 394

DRAG DROP

Drag and drop the NHRP flag on the left to the corresponding meaning on the right.

 

clip_image008

 

Correct Answer:

clip_image010

 

 

QUESTION 395

Which two actions can you take to recover an interface in a errdisable state? (Choose two.)

 

A.

Enable UDLD on the switch.

B.

Enable errdisable recovery on the switch.

C.

Execute the shutdown command on the interface, followed by the no shutdown command.

D.

Remove the related commands from the configuration and reenter them.

E.

Enable loop guard on the switch.

 

Correct Answer: BC

 

 

QUESTION 396

Which two tasks are required for configuring SNMP to send traps on a Cisco IOS device? (Choose two.)

 

A.

Create access controls for an SNMP community.

B.

Configure SNMP notifications.

C.

Configure the SNMP agent.

D.

Configure SNMP status monitoring and troubleshooting.

E.

Configure SNMP server group names.

F.

Configure the SNMP server engine ID.

 

Correct Answer: AB

Explanation:

The best current practices recommend applying Access Control Lists (ACLs) to community strings and ensuring that the requests community strings are not identical to notifications community strings. Access lists provide further protection when used in combination with other protective measures.

This example sets up ACL to community string:

access-list 1 permit 1.1.1.1 snmp-server communi
ty string1 ro 1

SNMP Notifications

A key feature of SNMP is the ability to generate notifications from an SNMP agent. These notifications do not require that requests be sent from the SNMP manager. Unsolicited (asynchronous) notifications can be generated as traps or inform requests. Traps are messages alerting the SNMP manager to a condition on the network. Inform requests (informs) are traps that include a request for confirmation of receipt from the SNMP manager. Notifications can indicate improper user authentication, restarts, the closing of a connection, loss of connection to a neighbor router, or other significant events.

Reference:

http://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/configuration/guide/ffun_c/fcf014.html#wp1007320

 

 

QUESTION 397

The no ip unreachables command is configured on interfaces to protect the control plane of a router. Which mechanism is impacted by using this command?

 

A.

ICMP redirects

B.

path MTU discovery

C.

source routing

D.

ICMP router discovery protocol

 

Correct Answer: B

 

 

QUESTION 398

Which three features are common to OSPF and IS-IS? (Choose three.)

 

A.

They both maintain a link-state database from which a Dijkstra-based SPF algorithm computes a shortest path tree.

B.

They both use DR and BDR in the broadcast network.

C.

They both use hello packets to form and maintain adjacencies.

D.

They both use NSSA and stub type areas to scale the network design.

E.

They both have areas to form a two-level hierarchical topology.

 

Correct Answer: ACE

 

 

QUESTION 399

Refer to the exhibit. A Cisco Catalyst 6500 Series Switch experiences high CPU utilization. What can be the cause of this issue, and how can it be prevented?

 

clip_image011

 

A.

The hardware routing table is full. Redistribute from BGP into IGP.

B.

The software routing table is full. Redistribute from BGP into IGP.

C.

The hardware routing table is full. Reduce the number of routes in the routing table.

D.

The software routing table is full. Reduce the number of routes in the routing table.

 

Correct Answer: C

Explanation:

FIB TCAM Exception – If you try to install more routes than are possible into the FIB TCAM you will see the following error message in the logs:

 

CFIB-SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched

 

%CFIB-SP-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched %CFIB-SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched

 

This error message is received when the amount of available space in the TCAM is exceeded. This results in high CPU. This is a FIB TCAM limitation. Once TCAM is full, a flag will be set and FIB TCAM exception is received. This stops from adding new routes to the TCAM. Therefore, everything will be software switched. The removal of routes does not help resume hardware switching. Once the TCAM enters the exception state, the system must be reloaded to get out of that state. You can view if you have hit a FIB TCAM exception with the following command:

 

6500-2#sh mls cef exception status

Current IPv4 FIB exception state = TRUE

Current IPv6 FIB exception state = FALSE

Current MPLS FIB exception state = FALSE

 

When the exception state is TRUE, the FIB TCAM has hit an exception. The maximum routes that can be installed in TCAM is increased by the mls cef maximum-routes command.

Reference: https://supportforums.cisco.com/document/59926/troubleshooting-high-cpu-6500-sup720

 

 

 

 

QUESTION 400

DRAG DROP

Drag and drop each PHB on the left to the functionality it performs on the right.

 

clip_image013

 

Correct Answer:

clip_image015

100% Free Download!
—Download Free Demo:400-101 Demo PDF
100% Pass Guaranteed!
Download 2017 Ensurepass 400-101 Full Exam PDF and VCE Q&As:1299
—Get 10% off your purchase! Copy it:TJDN-947R-9CCD [2017.07.01-2017.07.31]

Ensurepass ExamCollection Testking
Lowest Price Guarantee Yes No No
Up-to-Dated Yes No No
Real Questions Yes No No
Explanation Yes No No
PDF + VCE Yes No No
Free VCE Simulator Yes No No
Instant Download Yes No No

2017 Ensurepass IT Certification PDF and VCE