2016NEW Cisco.CCIE.(400-101)EXAM] CCIE Routing and Switching EXAM A PART5 (81-100) VCE DUMPS FOR FREE DOWNLOAD WITH 100%PASS ENSURE

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QUESTION 81

DRAG DROP

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

QUESTION 82

When you migrate a network from PVST+ to rapid-PVST+, which two features become inactive? (Choose two.)

A. Root guard

B. Loop guard

C. UplinkFast

D. UDLDE. BackboneFast

F. Bridge Assurance

Correct Answer: CE

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

It is good to know the UplinkFast and BackboneFast behavior before you start the migration process.

Here, the Access1 switch runs Cisco IOS. This output is taken before migration to the rapid-PVST+ mode:

You can see in the show spanning-tree summary command output that UplinkFast and BackboneFast are enabled, but are inactive in rapid-PVST mode.

Reference. http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series- switches/72836-rapidpvst-mig-config.html#upback1

QUESTION 83

Which statement is true about MLD?

A. MLD v1 gives hosts the ability to receive multicast packets from specific source addresses.

B. All MLD messages are sent with a link-local IPv6 source address of FF02::D.

C. The multicast address field is cleared to zero when sending an MLD report message.

D. MLD is used by IPv6 routers to discover multicast listeners on a directly attached link.

Correct Answer: D

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

IPv6 Multicast Listener Discovery (MLD) is used by IPv6 devices to discover multicast listeners (nodes that want to receive multicast packets destined for specific

multicast addresses) on directly attached links. There are two versions of MLD. MLD version 1 is based on version 2 of the IGMP for IPv4, and MLD version 2 is

based on version 3 of the IGMP for IPv4. IPv6 multicast for Cisco software uses both MLD version 2 and MLD version 1.

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 84

Which statement is true about LLDP?

A. LLDP provides VTP support.

B. LLDP does not use a multicast address to communicate.

C. LLDP can indicate only the duplex setting of a link, and not the speed capabilities.

D. LLDP does not support native VLAN indication.

Correct Answer: D

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

Cisco Discovery Protocol Versus LLDP-MED TLV Comparison

Reference.

http://www.cisco.com/en/US/technologies/tk652/tk701/technologies_white_paper0900aecd804cd4 6d.html

QUESTION 85

Which statement is true when using a VLAN ID from the extended VLAN range (10064094)?

A. VLANs in the extended VLAN range can be used with VTPv2 in either client or server mode.

B. VLANs in the extended VLAN range can only be used as private VLANs.

C. STP is disabled by default on extended-range VLANs.

D. VLANs in the extended VLAN range cannot be pruned.

Correct Answer: D

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

Enabling VTP pruning on a VTP server enables pruning for the entire management domain. Making VLANs pruning-eligible or pruning-ineligible affects pruning

eligibility for those VLANs on that device only (not on all switches in the VTP domain). VTP pruning takes effect several seconds after you enable it. VTP pruning

does not prune traffic from VLANs that are pruning- ineligible. VLAN 1 and VLANs 1002 to 1005 are always pruning-ineligible; traffic from these VLANs cannot be

pruned. Extended-range VLANs (VLAN IDs higher than 1005) are also pruning- ineligible.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12- 1_13_ea1/configuration/guide/3550scg/swvtp.html#wpxref48156

QUESTION 86

Which statement is true about trunking?

A. Cisco switches that run PVST+ do not transmit BPDUs on nonnative VLANs when using a dot1q trunk.

B. When removing VLAN 1 from a trunk, management traffic such as CDP is no longer passed in that VLAN.

C. DTP only supports autonegotiation on 802.1q and does not support autonegotiation for ISL.

D. DTP is a point-to-point protocol.Correct Answer: D

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

Ethernet trunk interfaces support different trunking modes. You can set an interface as trunking or nontrunking or to negotiate trunking with the neighboring

interface. To autonegotiate trunking, the interfaces must be in the same VTP domain.

Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Point-to-Point Protocol. However, some internetworking devices might forward

DTP frames improperly, which could cause misconfigurations.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12- 2_55_se/configuration/guide/scg3750/swvlan.html

QUESTION 87

Which three statements are true about an EtherChannel? (Choose three.)

A. PAGP and LACP can be configured on the same switch if the switch is not in the same EtherChannel.

B. EtherChannel ports in suspended state can receive BPDUs but cannot send them.

C. An EtherChannel forms between trunks that are using different native VLANs.

D. LACP can operate in both half duplex and full duplex, if the duplex setting is the same on both ends.

E. Ports with different spanning-tree path costs can form an EtherChannel.

Correct Answer: ABE

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

Answer A. EtherChannel groups running PAgP and LACP can coexist on the same switch or on different switches in the stack. Individual EtherChannel groups

can run either PAgP or LACP, but they cannot interoperate.

Answer B:

Answer E. Ports with different spanning-tree path costs can form an EtherChannel if they are otherwise compatibly configured. Setting different spanning-tree path

costs does not, by itself, make ports incompatible for the formation of an EtherChannel.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15- 0_2_EX/layer2/configuration_guide/b_lay2_152ex_2960-x_cg/

b_lay2_152ex_2960- x_cg_chapter_010.html

QUESTION 88

Which technology can be affected when switches are used that do not support jumbo frames?

A. 802.1x

B. BFD

C. OSPFv3

D. 802.1q

Correct Answer: D

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

The 802.1Q tag is 4 bytes. Therefore, the resulting Ethernet frame can be as large as 1522 bytes. If jumbo frames are not supported, then typically the MTU on an

Ethernet link needs to be lowered to 1496 to support this extra 802.1Q tag.

QUESTION 89

Which statement describes the native VLAN concept in an ISL trunk?A. It is the VLAN ID that is assigned to untagged packets.

B. It is the VLAN with highest priority.

C. It is the default VLAN for a trunk.

D. There is no native VLAN concept in an ISL trunk.

Correct Answer: D

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

ISL has no native VLAN concept because it places the entire ethernet frame in the payload of an ISL frame. Native VLANs is an 802.1Q specific concept

QUESTION 90

Which protocol is the encapsulating protocol for mtrace packets?

A. ICMP

B. IGMP

C. PIM

D. GRE

Correct Answer: B

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

“mtrace” is a diagnostic tool to trace the multicast path from a specified source to a destination for a multicast group. It runs over IGMP protocol. Mtrace uses any

information available to it to determine a previous hop to forward the trace towards the source.

Reference.

http://www.brocade.com/downloads/documents/html_product_manuals/NI_05500c_MULTICAST/ wwhelp/wwhimpl/common/html/

wwhelp.htm#context=NI_MCAST&file=IP_Multicast.3.04.html

QUESTION 91

Assume that the following MAC addresses are used for the bridge ID MAC address by four different switches in a network. Which switch will be elected as the

spanning-tree root bridge?

A. SwitchA uses MAC 1000.AA-AA-AA-AA-AA-AA.B. SwitchB uses MAC 2000.BB-BB-BB-BB-BB-BB.

C. SwitchC uses MAC 3000.CC-CC-CC-CC-CC-CC.

D. SwitchD uses MAC 4000.DD-DD-DD-DD-DD-DD.

Correct Answer: A

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

The switch with the highest switch priority (the lowest numerical priority value) is elected as the root switch. If all switches are configured with the default priority

(32768), the switch with the lowest MAC address in the VLAN becomes the root switch.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12- 2_53_se/configuration/guide/2960scg/swstp.html

QUESTION 92

What is the destination MAC address of a BPDU frame?

A. 01-80-C2-00-00-00

B. 01-00-5E-00-00-00

C. FF-FF-FF-FF-FF-FF

D. 01-80-C6-00-00-01

Correct Answer: A

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

The root-bridge election process begins by having every switch in the domain believe it is the root and claiming it throughout the network by means of Bridge

Protocol Data Units (BPDU). BPDUs are Layer 2 frames multicast to a well-known MAC address in case of IEEE STP (01-80-C2-00-00-00) or vendor-assigned

addresses, in other cases.

Reference. http://www.ciscopress.com/articles/article.asp?p=1016582

QUESTION 93

Refer to the exhibit.

All switches are Cisco switches. Assume that Cisco Discovery Protocol is enabled only on switches A and C.

Which information is returned when you issue the command show cdp neighbors on switch C?

A. a limited amount of information about switch B

B. no neighbor details will be returned

C. neighbor details for switch B

D. neighbor details for switch A

E. neighbor details for switch C

Correct Answer: B

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

CDP is used to discover information on directly connected neighbors only, so in this case SwitchC would only be able to obtain CDP information from SwitchB.

However, since SwitchB is not running CDP then no neighbor information will be seen on SwitchC. Same goes for Switch A also in this topology.

QUESTION 94

Which two features are supported when Cisco HDLC is implemented? (Choose two.)

A. error recovery

B. error detection

C. asynchronous links

D. multiple protocols

Correct Answer: BD

Section: Layer 2 Technologies

ExplanationExplanation/Reference:

Explanation:

HDLC’s frame check sequence (FCS) is a 16-bit CRC-CCITT or a 32-bit CRC-32 computed over the Address, Control, and Information fields. It provides a means

by which the receiver can detect errors that may have been induced during the transmission of the frame, such as lost bits, flipped bits, and extraneous bits.

Cisco’s HDLC contains a proprietary field that is used to support multiple protocols.

Reference. http://en.wikipedia.org/wiki/High-Level_Data_Link_Control

QUESTION 95

Refer to the exhibit.

With these configurations for R1 and R2, which statement about PPP authentication is true?

A. Authentication fails because R1 is missing a username and password.

B. R2 responds with the correct authentication credentials.

C. R2 requires authentication from R1.

D. R1 requires authentication from R2.

Correct Answer: C

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

Only R2 is configured with the “PPP authentication PAP” command so it requires authentication from R1, but R1 does not require authentication from R2.QUESTION 96

Refer to the exhibit.

You must complete the configuration on R1 so that a maximum of three links can be used and fragmentation is supported.

Which additional configuration accomplishes this task?

A. interface Multilink19

ip address 192.168.1.1 255.255.255.0

ppp multilink

ppp multilink group 19

ppp multilink links minimum 1

ppp multilink links maximum 3

ppp multilink interleave

B. interface Multilink19

ip address 192.168.1.1 255.255.255.0

ppp multilink

ppp multilink group 19

ppp multilink links maximum 3

ppp multilink fragment delay 20C. interface Multilink19

ip address 192.168.1.1 255.255.255.0

ppp multilink

ppp multilink group 19

ppp multilink links maximum 3

ppp multilink fragment delay 20

ppp multilink interleave

D. interface Multilink19

ip address 192.168.1.1 255.255.255.252

ppp multilink

ppp multilink group 19

ppp multilink links maximum 3

ppp multilink interleave

Correct Answer: A

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

The “ppp multilink interleave” command is needed to enable link fragmentation and Interleaving (LFI). The Cisco IOS Link Fragmentation and Interleaving (LFI)

feature uses Multilink PPP (MLP). MLP provides a method of splitting, recombining, and sequencing datagrams across multiple logical data links. MLP allows

packets to be fragmented and the fragments to be sent at the same time over multiple point-to-point links to the same remote address.

ppp multilink links maximum

To limit the maximum number of links that Multilink PPP (MLP) can dial for dynamic allocation, use the ppp multilink links maximum command in interface

configuration mode.

Reference.

http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcflfi.html

QUESTION 97

Refer to the exhibit.

tWhich statement about configuring the switch to manage traffic is true?

A. The switchport priority extend cos command on interface FastEthernet0/0 prevents traffic to and from the PC from taking advantage of the high-priority data

queue that is assigned to the IP phone.

B. The switchport priority extend cos command on interface FastEthernet0/0 enables traffic to and from the PC to use the high priority data queue that is assigned

to the IP phone.

C. When the switch is configured to trust the CoS label of incoming traffic, the trusted boundary feature is disabled automatically.

D. The mls qos cos override command on interface FastEthernet0/0 configures the port to trust the CoS label of traffic to and from the PC.

Correct Answer: A

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

In some situations, you can prevent a PC connected to the Cisco IP Phone from taking advantage of a high-priority data queue. You can use the switchport priority

extend cos interface configuration command to configure the telephone through the switch CLI to override the priority of the traffic received from the PC.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12- 1_22_ea2/configuration/guide/2950scg/swqos.html

QUESTION 98

DRAG DROP

Drag and drop the PPPoE packet type on the left to the corresponding description on the right.

Select and Place:

Correct Answer:

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

QUESTION 99

What is the destination multicast MAC address for BPDUs on the native VLAN, for a switch that is running 802.1D?

A. 0185. C400. 0000

B. 0100.0CCC.CCCC

C. 0100.0CCC.CCCDD. 0180.C200.0000

Correct Answer: D

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

If the native vlan is 1:

A STP BPDU for VLAN 1 will be sent untagged to MAC 0180.c200.0000 (this is the common spanning tree)

A PVST+ BPDU for VLAN 1 will be sent untagged to MAC 0100.0ccc.cccd

A PVST+ BPDU for all other vlans will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd (with a PVID = to the VLAN)

If the native vlan is not 1:

A STP BPDU for VLAN 1 will be sent untagged (on the native vlan) to MAC 0180.c200.0000 (this is the common spanning tree)

A PVST+ BPDU for VLAN1 will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd (with a PVID=1)

A PVST+ BPDU for the native vlan will be sent untagged to MAC 0100.0ccc.cccd (with a PVID=native vlan)

A PVST+ BPDU for all other vlans will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd (with a PVID = to the VLAN)

QUESTION 100

Refer to the exhibit.

All switches have default bridge priorities, and originate BPDUs with MAC addresses as indicated.

The numbers shown are STP link metrics.

After STP converges, you discover that traffic from switch SWG toward switch SWD takes a less optimal path. What can you do to optimize the STP tree in this

switched network?A. Change the priority of switch SWA to a lower value than the default value.

B. Change the priority of switch SWB to a higher value than the default value.

C. Change the priority of switch SWG to a higher value than the default value.

D. Change the priority of switch SWD to a lower value than the default value.

Correct Answer: D

Section: Layer 2 Technologies

Explanation

Explanation/Reference:

Explanation:

In this topology, we see that all port paths and priorities are the same, so the lowest MAC address will be used to determine the best STP path. From SWG, SWE

will be chosen as the next switch in the path because it has a lower MAC address than SWF. From SWE, traffic will go to SWC because it has a lower MAC

address, and then to SWD, instead of going from SWE directly to SWD. If we lower the priority of SWD (lower means better with STP) then traffic will be sent

directly to SWD.

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