Download New Updated (July) Cisco 400-101 Actual Test 71-80

Ensurepass

 

 

QUESTION 71

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. Which two ports are in blocking state after STP converges? (Choose two.)

 

clip_image001

A.

the port on switch SWD that connects to switch SWE

B.

the port on switch SWF that connects to switch SWG

C.

the port on switch SWD that connects to switch SWC

D.

the port on switch SWB that connects to switch SWD

 

Correct Answer: CD

Explanation:

This is a scenario that wants you to demonstrate understanding of the Root switch and Root port election process. So, it’s best to start with where the root switch will be and work down from there. It’s setup nicely because the lowest MAC address switch starts at the top and then the lower priority/higher mac addresses move down the architecture. SWA wins the root election and of course all ports in SWA are forwarding. SWB introduces the possibility for a switching loop so it’s important to understand which ports will be put into the blocking state. Since SWD is a higher MAC address it will end up with a blocked port connected to SWB to prevent a loop: and this is one of the correct answers. To prevent the possibility of another potential switching loop, SWD again ends up with the higher MAC address so blocking the link between D and C prevents a B/C/D switching loop.

 

 

QUESTION 72

Which statement is true about IGMP?

 

A.

Multicast sources send IGMP messages to their first-hop router, which then generates a PIM join message that is then sent to the RP.

B.

Multicast receivers send IGMP messages to their first-hop router, which then forwards the IGMP messages to the RP.

C.

IGMP messages are encapsulated in PIM register messages and sent to the RP.

D.

Multicast receivers send IGMP messages to signal their interest to receive traffic for specific multicast groups.

 

Correct Answer: D

Explanation:

clip_image003

 

In the example shown above, the receivers (the designated multicast group) are interested in receiving the video data stream from the source. The receivers indicate their interest by sending an Internet Group Management Protocol (IGMP) host report to the routers in the network. The routers are then responsible for delivering the data from the source to the receivers.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/mcst_ovr.html

 

 

QUESTION 73

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

 

A.

By default, RTSP uses a separate TCN BPDU when interoperating with 802.1D switches.

B.

By default, RTSP does not use a separate TCN BPDU when interoperating with 802.1D switches.

C.

If a designated port receives an inferior BPDU, it immediately triggers a reconfiguration.

D.

By default, RTSP uses the topology change TC flag.

E.

If a port receives a superior BPDU, it immediately replies with its own information, and no reconfiguration is triggered.

 

Correct Answer: BD

Explanation:

The RSTP does not have a separate topology change notification (TCN) BPDU. It uses the topology change (TC) flag to show the topology changes.

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

 

 

QUESTION 74

Refer to the exhibit. Which two statements are true about the displayed STP state? (Choose two.)

 

clip_image005

 

A.

The STP version configured on the switch is IEEE 802.1w.

B.

Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago.

C.

The switch does not have PortFast configured on Gi0/15.

D.

BPDUs with the TCN bit set are transmitted over port channel 1.

 

Correct Answer: CD

Explanation:

A port enabled with portfast will not send topology changes when a port goes up or down, but here we see that 296 TCN’s were sent so we know that Gi 0/15 does not have portfast enabled. TCN’s are sent using BPDU’s over the root port, which we see is port channel 1.

 

 

 

 

 

QUESTION 75

DRAG DROP

clip_image007

 

Correct Answer:

clip_image009

 

 

QUESTION 76

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.

UDLD

E.

BackboneFast

F.

Bridge Assurance

 

Correct Answer: CE

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:

Access1#show spanning-tree vlan 10

VLAN0010

Spanning tree enabled protocol ieee

Root ID Priority 24586

Address 0015.63f6.b700

Cost 3019

Port 107 (FastEthernet3/0/1)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

 

Bridge ID Priority 49162 (priority 49152 sys-id-ext 10)

Address 000f.f794.3d00

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Uplinkfast enabled

 

Interface Role Sts Cost Prio.Nbr Type

—————- —- — ——— ——– ——————————–

Fa3/0/1 Root FWD 3019 128.107 P2p

Fa3/0/2 Altn BLK 3019 128.108 P2p

 

Access1#show spanning-tree summary

Switch is in pvst mode

Root bridge for: none

Extended system ID is enabled

Portfast Default is disabled

PortFast BPDU Guard Default is enabled

Portfast BPDU Filter Default is disabled

Loopguard Default is disabled

EtherChannel misconfig guard is enabled

UplinkFast is enabled

BackboneFast is enabled

Configured Pathcost method used is short

 

Name Blocking Listening Learning Forwarding STP Active

———————- ——– ——— ——– ———- ———-

 

VLAN0010 1 0 0 1 2

VLAN0020 1 0 0 1 2

———————- ——– ——— ——– ———- ———-

2 vlans 2 0 0 2 4

This output is taken after the mode is changed to rapid-PVST+:

 

Access1#show spanning-tree vlan 10

VLAN0010

Spanning tree enabled protocol rstp

Root ID Priority 24586

Address 0015.63f6.b700

Cost 3019

Port 107 (FastEthernet3/0/1)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

 

Bridge ID Priority 49162 (priority 49152 s
ys-id-ext 10)

Address 000f.f794.3d00

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

UplinkFast enabled but inactive in rapid-pvst mode

 

Interface Role Sts Cost Prio.Nbr Type

—————- —- — ——— ——– ——————————–

Fa3/0/1 Root FWD 3019 128.107 P2p

Fa3/0/2 Altn BLK 3019 128.108 P2p

 

Access1#show spanning-tree summary

Switch is in rapid-pvst mode

Root bridge for: none

Extended system ID is enabled

Portfast Default is disabled

PortFast BPDU Guard Default is enabled

Portfast BPDU Filter Default is disabled

Loopguard Default is disabled

EtherChannel misconfig guard is enabled

UplinkFast is enabled but inactive in rapid-pvst mode

BackboneFast is enabled but inactive in rapid-pvst mode

Configured Pathcost method used is short

 

Name Blocking Listening Learning Forwarding STP Active

———————- ——– ——— ——– ———- ———-

 

VLAN0010 1 0 0 1 2

VLAN0020 1 0 0 1 2

———————- ——– ——— ——– ———- ———-

2 vlans 2 0 0 2 4

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 77

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

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 78

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

Explanation:

Cisco Discovery Protocol Versus LLDP-MED TLV Comparison

TLV Function

LLDP TLV

Cisco Discovery Protocol TLV

Native VLAN support-Indicates the native VLAN

No

Native VLAN TLV

 

Reference:

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

 

 

QUESTION 79

Which statement is true when using a VLAN ID from the extended VLAN range (1006?094)?

 

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

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 80

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

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

 

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