Download New Updated (July) Cisco 400-101 Actual Test 91-100

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QUESTION 91

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?

 

clip_image002

 

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 20

C.

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

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 92

DRAG DROP

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Correct Answer:

clip_image006

 

 

QUESTION 93

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.CCCD

D.

0180.C200.0000

 

Correct Answer: D

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.cccdA 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 94

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?

 

clip_image008

 

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

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 th
e 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.

 

QUESTION 95

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

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 fast-converging routing protocol like EIGRP, and still require that each device maintain it’s 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 96

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

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 97

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?

 

clip_image010

 

A.

IGMP filtering

B.

MLD snooping

C.

IGMP snooping

D.

MLD filtering

 

Correct Answer: C

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 98

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

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 99

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

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 to monitor 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/conf iguration/guide/n1000v_troubleshooting/trouble_15span.html

 

 

QUESTION 100

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

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

 

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