2016NEW Cisco.CCIE.(400-101)EXAM] CCIE Routing and Switching EXAM A PART6 (101-120) VCE DUMPS FOR FREE DOWNLOAD WITH 100%PASS ENSURE

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QUESTION 101

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

A. VSS separates the control planes of the active and the standby chassis.

B. Configuration changes can be made on both active and standby chassis.

C. When the VSS active chassis recovers after a failure, it initiates a switchover and takes on the active role again.

D. VSS unifies the control planes of the active and the standby chassis.

E. HSRP configuration is not required to run VSS.

F. The VSS standby chassis monitors the VSS active chassis using the VSL.

Correct Answer: DEF

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

VSS operates on a unified control plane with a distributed forwarding architecture in which the active supervisor (or switch) is responsible for actively participating

with the rest of the network and for managing and maintaining control plane information.

VSS actually removes the need for a next-hop redundancy protocol like HSRP or VRRP. These first-hop redundancy protocols are usually heavily tied to a fastconverging

routing protocol like EIGRP, and still require that each device maintain its own control plane.

The standby chassis monitors the active chassis using the VSL. If it detects failure, the standby chassis initiates a switchover and takes on the active role. When

the failed chassis recovers, it takes on the standby role.Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15- 1SY/config_guide/sup2T/15_1_sy_swcg_2T/virtual_switching_systems.pdf

QUESTION 102

Which flag in a configuration BPDU instructs all switches to shorten their bridge table aging process from the default 300 seconds to the current forward delay

value?

A. topology change bit

B. topology change acknowledgment bit

C. priority bit

D. max-age bit

Correct Answer: A

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

The Root Bridge continues to set the Topology Change flag (TCN bit) in all Configuration BPDUs that it sends out for a total of Forward Delay + Max Age seconds

(default = 35 (20+15) seconds). This flag instructs all bridges to shorten their MAC address table (Bridge table) aging process from the default value of 300

seconds to the current Forward Delay value of the bridge (default=15 seconds).

The TCA flag is set by the upstream bridge to tell the downstream bridges to stop sending TCN BPDUs. The TC flag is set in configuration BPDU by the Root

Bridge to shorten the bridge table age-out period from default 300 seconds to Forward Delay seconds.

QUESTION 103

Refer to the exhibit.

Which technology can be used on the switch to enable host A to receive multicast packets for 239.2.2.2 but prevent host B from receiving them?

A. IGMP filtering

B. MLD snooping

C. IGMP snooping

D. MLD filtering

Correct Answer: C

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic. The feature allows a network switch to listen in on the

IGMP conversation between hosts and routers. By listening to these conversations the switch maintains a map of which links need which IP multicast streams.

Multicasts may be filtered from the links which do not need them and thus controls which ports receive specific multicast traffic.

QUESTION 104

Which option describes the purpose of the PPP endpoint discriminator?A. It identifies the maximum payload packet.

B. It notifies the peer that it prefers 12-bit sequence numbers.

C. It identifies the system attached to the link.

D. It determines whether a loopback is on the link.

Correct Answer: C

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

In situations in which many clients use the same username to initiate an MP connection, or when interoperating with non-Cisco routers, you need to control the

order in which the bundle name is created. It is necessary to configure the access server to create a bundle name based on the endpoint discriminator first, the

username second, or both. The endpoint discriminator identifies the system transmitting the packet and advises the network access server (NAS) that the peer on

this link could be the same as the peer on another existing link. Because every client has a unique endpoint discriminator, only multiple links from the same client

are bundled into a single unique MP connection. For example, consider when two PC clients initiate a multilink connection to an access server using the same

username. If the multilink bundle name is established based on the endpoint discriminator first, then on the username or on both, the NAS can accurately bundle

the links from each client using the endpoint discriminator as a bundle name. This bundle name is unique to the peer system transmitting the packet.

Reference. http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10238- mppp-bundle-name.html

QUESTION 105

Which three statements about SPAN traffic monitoring are true? (Choose three.)

A. Traffic from a non-source VLAN is discarded when it arrives on a source VLAN.

B. Multiple sessions can send traffic to an individual destination port.

C. It supports up to 32 SPAN ports per switch.

D. The destination port acts as a normal switchport.

E. It supports up to 64 SPAN ports per switch.

F. Only one session can send traffic to an individual destination port.

Correct Answer: AEF

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

You can create up to a total of 64 SPAN and ERSPAN sessions to define sources and destinations on the local device.You can also create a SPAN session tomonitor multiple VLAN sources and choose only VLANs of interest to transmit on multiple destination ports. For example, you can configure SPAN on a trunk port

and monitor traffic from different VLANs on different destination ports.

You can configure a particular destination port in only one SPAN session.

Traffic from a non-source VLAN is discarded when it arrives on a source VLAN.

Reference.

http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus1000/sw/4_0/troubleshooting/confi guration/guide/n1000v_troubleshooting/trouble_15span.html

QUESTION 106

Which option describes how a VTPv3 device responds when it detects a VTPv2 device on a trunk port?

A. It sends VTPv3 packets only.

B. It sends VTPv2 packets only.

C. It sends VTPv3 and VTPv2 packets.

D. It sends a special packet that contains VTPv3 and VTPv2 packet information.

Correct Answer: C

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

When a VTP version 3 device on a trunk port receives messages from a VTP version 2 device, the VTP version 3 device sends a scaled-down version of the

VLAN database on that particular trunk in a VTP version 2 format. A VTP version 3 device does not send out VTP version 2-formatted packets on a trunk port

unless it first receives VTP version 2 packets on that trunk. If the VTP version 3 device does not receive VTP version 2 packets for an interval of time on the trunk

port, the VTP version 3 device stops transmitting VTP version 2 packets on that trunk port.

Even when a VTP version 3 device detects a VTP version 2 device on a trunk port, the VTP version 3 device continues to send VTP version 3 packets in addition

to VTP version 3 device 2 packets, to allow two kinds of neighbors to coexist on the trunk. VTP version 3 sends VTP version 3 and VTP version 2 updates on VTP

version 2-detected trunks.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/vtp.html

QUESTION 107

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

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

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/C LIConfigurationGuide/SpanningEnhanced.html

QUESTION 108

What is the hop limit for an MLD message?

A. 1

B. 2

C. 15

D. 255

Correct Answer: A

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

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 109

Refer to the exhibit.

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

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

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

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 110

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

A. Active Discovery Phase

B. IKE Phase

C. Main Mode PhaseD. PPP Session Phase

E. Aggressive Mode Phase

F. Negotiation Phase

Correct Answer: AD

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

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 111

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

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

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 112

DRAG DROP

Drag and drop the LACP elements on the left into the correct priority order in the hot-standby port-selection process on the right.

Select and Place:

Correct Answer:

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

QUESTION 113

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

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

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 114Which 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

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

Basic Management TLV Set

This set includes the following five TLVs used in LLDP:

1. 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.

2. 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.

3. 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.

4. 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.

5. 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

QUESTION 115

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: DSection: Layer 2 Technologies

Explanation

Explanation/Reference:

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 116

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

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

To configure an EtherChannel using LACP negotiation, each side must be set to either activeor 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.

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

QUESTION 117

In which 802.1D port state are the root bridge, the root port, and the designated port(s) elected?

A. Listening

B. learning

C. forwarding

D. blocking

E. disabled

Correct Answer: A

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

STP switch port states:

Blocking – A port that would cause a switching loop if it were active. No user data is sent or received over a blocking port, but it may go into forwarding mode if

the other links in use fail and the spanning tree algorithm determines the port may transition to the forwarding state. BPDU data is still received in blocking

state. Prevents the use of looped paths.

Listening – The switch processes BPDUs and awaits possible new information that would cause it to return to the blocking state. It does not populate the MAC

address table and it does not forward frames. In this state the root bridge, the root port, and the designated port(s) are elected.

Learning – While the port does not yet forward frames it does learn source addresses from frames received and adds them to the filtering database (switching

database). It populates the MAC Address table, but does not forward frames.

Forwarding – A port receiving and sending data, normal operation. STP still monitors incoming BPDUs that would indicate it should return to the blocking state

to prevent a loop.

Disabled – Not strictly part of STP, a network administrator can manually disable a port.

Reference. http://en.wikipedia.org/wiki/Spanning_Tree_Protocol

QUESTION 118

In a network where a Layer 2 switch interconnects several routers, which feature restricts multicast packets for each IP multicast group to only those mulicast

router ports that have downstream receivers joined to that group?

A. PIM snooping

B. IGMP snooping

C. IGMP filterD. IGMP proxy

Correct Answer: A

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

In networks where a Layer 2 switch interconnects several routers, such as an Internet exchange point (IXP), the switch floods IP multicast packets on all multicast

router ports by default, even if there are no multicast receivers downstream. With PIM snooping enabled, the switch restricts multicast packets for each IP

multicast group to only those multicast router ports that have downstream receivers joined to that group. When you enable PIM snooping, the switch learns which

multicast router ports need to receive the multicast traffic within a specific VLAN by listening to the PIM hello messages, PIM join and prune messages, and

bidirectional PIM designated forwarder-election messages.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/snooppim.html

QUESTION 119

Which three statements about Cisco HDLC are true? (Choose three.)

A. HDLC serial encapsulation provides asynchronous framing and error detection.

B. Serial link keepalives are maintained by SLARP.

C. HDLC serial encapsulation provides synchronous framing without retransmission.

D. HDLC frame size can be reduced with MPPC compression.

E. The interface is brought down after five ignored keepalives.

F. The interface is brought down after three ignored keepalives.

Correct Answer: BCF

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also

provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. For each encapsulation type, a

certain number of keepalives ignored by a peer triggers the serial interface to transition to the down state. For HDLC encapsulation, three ignored keepalives

causes the interface to be brought down.

By default, synchronous serial lines use the High-Level Data Link Control (HDLC) serial encapsulation method, which provides the synchronous framing and error

detection functions of HDLC without windowing or retransmission.

Reference.http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/819_S CG/6ser_conf.html#78662

QUESTION 120

Which two fields reside in the initial CHAP challenge packet? (Choose two.)

A. the authentication name of the challenger

B. a random hash value generated by the device

C. the hashed packet type ID

D. the packet type ID in clear text

Correct Answer: AD

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

When a caller A dials in to an access server B, The Access server sends across the link an initial Type 1 authentication packet called a Challenge. This Challenge

packet contains a randomly generated number, an ID sequence number to identify the challenge (sent in clear text) and the authentication name of the challenger.

Reference. http://www.rhyshaden.com/ppp.htm

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