Download New Updated (July) Cisco 400-101 Actual Test 101-110

Ensurepass

QUESTION 101

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.

 

Correct Answer: ACE

Explanation:

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.

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

 

 

QUESTION 102

What is the hop limit for an MLD message?

 

A.

1

B.

2

C.

15

D.

255

 

Correct Answer: A

Explanation:

MLD uses the Internet Control Message Protocol (ICMP) to carry its messages. All MLD messages are link-local with a hop limit of 1, and they all have the alert option set. The alert option implies an implementation of the hop-by-hop option header.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_lsm/configuration/xe-3s/imc-lsm-xe-3s-book/ipv6-mcast-mld-xe.html

 

 

 

 

 

 

 

 

QUESTION 103

Refer to the exhibit. Which action must you take to enable the WAN link to function properly?

 

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A.

Enter a clock rate on the DCE interface.

B.

Enter a clock rate on the DTE interface.

C.

Enter a compression algorithm on both interfaces.

D.

Configure both interfaces for HDLC encapsulation.

 

Correct Answer: A

Explanation:

When connecting a serial cable to the serial interface of the router, clocking is provided by an external device, such as a CSU/DSU device. A CSU/DSU (Channel Service Unit/Data Service Unit) is a digital-interface device used to connect a router to a digital circuit. The router is the DTE (Data Terminal Equipment) and the external device is the DCE (Data Communications Equipment), where the DCE provides the clocking. However, in some cases we might connect two routers back-to-back using the routers’ serial interfaces (ExamplE. Inside the router labs). Each router is a DTE by default.

Since clocking is required to enable the interface, one of the two routers should function as DCE and should provide clocking. This can be done by using the “clock rate” command, from the interface configuration mode.

Reference: http://www.omnisecu.com/cisco-certified-network-associate-ccna/how-to-configure-router-serial-interfaces.php

 

 

QUESTION 104

Which two options are the two main phases of PPPoE? (Choose two.)

 

A.

Active Discovery Phase

B.

IKE Phase

C.

Main Mode Phase

D.

PPP Session Phase

E.

Aggressive Mode Phase

F.

Negotiation Phase

 

Correct Answer: AD

Explanation:

PPPoE is composed of two main phases:

Active Discovery Phase–In this phase, the PPPoE client locates a PPPoE server, called an access concentrator. During this phase, a Session ID is assigned and the PPPoE layer is established.

PPP Session Phase–In this phase, PPP options are negotiated and authentication is performed.

Once the link setup is completed, PPPoE functions as a Layer 2 encapsulation method, allowing data to be transferred over the PPP link within PPPoE headers.

Reference: http://www.cisco.com/c/en/us/td/docs/security/asa/asa92/configuration/vpn/asa-vpn-cli/vpn-pppoe.html

 

 

QUESTION 105

Which three statements about EVCs are true? (Choose three.)

 

A.

Spanning Tree must use MST mode on EVC ports.

B.

PAGP is supported on EVC ports.

C.

Spanning Tree must use RSTP mode on EVC ports.

D.

LACP is supported on EVC ports.

E.

Layer 2 multicast framing is supported.

F.

Bridge domain routing is required.

 

Correct Answer: ABD

Explanation:

EVC support requires the following:

-The spanning tree mode must be MST.

-The dot1ad global configuration mode command must be configured.

 

These Layer 2 port-based features can run with EVC configured on a port:

-PAGP

-LACP

-UDLD

-LLDP

-CDP

-MSTP

 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SY/configuration/guide/sy_swcg/ethernet_virtual_connection.html

 

 

QUESTION 106

DRAG DROP

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Correct Answer:

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QUESTION 107

Which statement about Cisco Discovery Protocol is true?

 

A.

The multicast address 0100.0cdd.dddd is used as the destination address for periodic advertisements.

B.

An inactive VLAN that is configured on an access port passes periodic Cisco Discovery Protocol advertisements.

C.

The multicast address 0100.0ccc.ccd is used as the destination address for periodic advertisements.

D.

A VLAN must be active on an access port before periodic Cisco Discovery Protocol advertisements are passed.

 

Correct Answer: D

Explanation:

All CDP packets include a VLAN ID. If you configure CDP on a Layer 2 access port, the CDP packets sent from that access port include the access port VLAN ID. If you configure CDP on a Layer 2 trunk port, the CDP packets sent from that trunk port include the lowest configured VLAN ID allowed on that trunk port.

CDP messages on the active physical interfaces (Ethernet NIC) to a well-known multicast address (0100.0CCC.CCCC.)

 

 

QUESTION 108

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

 

Correct Answer: ABD

Explanation:

Basic Management TLV SetThis set includes the following five TLVs used in LLDP:

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

 

 

QUESTION 109

Which command enables L2 QoS support in all VLANs (including the native VLAN)?

 

A.

switchport priority extend cos

B.

mls qos trust dscp

C.

mls qos rewrite ip dscp

D.

switchport trunk native vlan tag

 

Correct Answer: D

Explanation:

You can enter the switchport trunk native vlan tag command to enable the tagging of native VLAN traffic on a per-port basis. When tagging is enabled, all the packets on the native VLAN are tagged and all incoming untagged data packets are dropped, but untagged control packets are accepted. When tagging is enabled, it will allow for L2 QoS support in all VLANs, including the native VLAN.

 

QUESTION 110

Which three modes are valid for forming an EtherChannel between the ports of two switches? (Choose three.)

 

A.

Active/active

B.

Active/passive

C.

Passive/passive

D.

Auto/auto

E.

Auto/desirable

F.

Desirable/on

 

Correct Answer: ABE

Explanation:

To configure an EtherChannel using LACP negotiation, each side must be set to either active or passive; only interfaces configured in active mode will attempt to negotiate an EtherChannel. Passive interfaces merely respond to LACP requests. PAgP behaves the same, but its two modes are refered to as desirable and auto.

 

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Reference: http://packetlife.net/blog/2010/jan/18/etherchannel-considerations/

 

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