[Free] 2017(Apr) Ensurepass Testking Cisco 300-115 Latest Dumps 81-90

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Implementing Cisco IP Switched Networks (SWITCH v2.0)

QUESTION 81

The network manager has requested that several new VLANs (VLAN 10, 20, and 30) are allowed to traverse the switch trunk interface. After the command switchport trunk allowed vlan 10,20,30 is issued, all other existing VLANs no longer pass traffic over the trunk. What is the root cause of the problem?

 

A.

The command effectively removed all other working VLANs and replaced them with the new VLANs.

B.

VTP pruning removed all unused VLANs.

C.

ISL was unable to encapsulate more than the already permitted VLANs across the trunk.

D.

Allowing additional VLANs across the trunk introduced a loop in the network.

 

Correct Answer: A

Explanation:

The “switchport trunk allowed vlan” command will only allow the specified VLANs, and overwrite any others that were previously defined. You would also need to e
xplicitly allow the other working VLANs to this configuration command, or use the “issue the switchport trunkallowed vlan add vlan-list” command instead to add these 3 VLANS to the other defined allowed VLANs.

Reference: https://supportforums.cisco.com/document/11836/how-define-vlans-allowed-trunk-link

 

 

QUESTION 82

Refer to the exhibit. A network engineer wants to analyze all incoming and outgoing packets for an interface that is connected to an access switch. Which three items must be configured to mirror traffic to a packet sniffer that is connected to the distribution switch? (Choose three.)

 

clip_image001

 

A.

A monitor session on the distribution switch with a physical interface as the source and the remote SPAN VLAN as the destination

B.

A remote SPAN VLAN on the distribution and access layer switch

C.

A monitor session on the access switch with a physical interface source and the remote SPAN VLAN as the destination

D.

A monitor session on the distribution switch with a remote SPAN VLAN as the source and physical interface as the destination

E.

A monitor session on the access switch with a remote SPAN VLAN source and the physical interface as the destination

F.

A monitor session on the distribution switch with a physical interface as the source and a physical interface as the destination

 

Correct Answer: BCD

Explanation:

You can analyze network traffic passing through ports or VLANs by using SPAN or RSPAN to send a copy of the traffic to another port on the switch or on another switch that has been connected to a network analyzer or other monitoring or security device. SPAN copies (or mirrors) traffic received or sent (or both) on source ports or source VLANs to a destination port for analysis.

RSPAN supports source ports, source VLANs, and destination ports on different switches (or different switch stacks), enabling remote monitoring of multiple switches across your network. The traffic for each RSPAN session is carried over a user-specified RSPAN VLAN that is dedicated for that RSPAN session in all participating switches. The RSPAN traffic from thesource ports or VLANs is copied into the RSPAN VLAN and forwarded over trunk ports carrying the RSPAN VLAN to a destination session monitoring the RSPAN VLAN. Each RSPAN source switch must have either ports or VLANs as RSPAN sources. The destination is always a physical port.

Reference:http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swspan.html

 

 

QUESTION 83

Refer to the exhibit. All ports are members of VLAN 10. Considering the default cost of upstream bridges to the root bridge is equal, which option will be the new root port for VLAN 10?

 

clip_image002

 

A.

interface f0/13

B.

interface f0/14

C.

interface f0/15

D.

interface f0/21

 

Correct Answer: D

Explanation:

Root Port election on each bridge

Each (non-Root) bridge has exactly one Root Port, which represents the best path to the Root Bridge.

In this case, fa0/21 has the lowest cost, so it will be the root port. Reference:https://community.extremenetworks.com/extreme/topics/802_1d_spanning_tree_election_rules

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 84

Refer to the exhibit. Why would the switch be considered as a root bridge?

 

clip_image003

 

A.

The bridge priority is 1 and all ports are forwarding.

B.

The switch priority for VLAN 1 and the macro specifies “This Bridge is the root”.

C.

The bridge priority is 128.19 and all ports are forwarding.

D.

The switch priority value is zero, it has the lowest priority value for VLAN 1.

 

Correct Answer: D

Explanation:

For priority, the range is 0 to 61440 in increments of 4096; the default is 32768. The lower the number, the more likely the switch will be chosen as the root switch. Reference:http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_9_ea1/configuration/guide/swstp.html#wp1020666

 

 

QUESTION 85

Which action allows a network engineer to limit a default VLAN from being propagated across all trunks?

 

A.

Upgrade to VTP version 3 for advanced feature set support.

B.

Enable VTP pruning on the VTP server.

C.

Manually prune default VLAN with switchport trunk allowed vlans remove.

D.

Use trunk pruning vlan 1.

 

Correct Answer: C

Explanation:

Manaully pruning the default VLAN (1) can only be done with the “switchport trunk allowed vlans remove” command. VLAN 1 is not VTP pruning eligible so it cannot be done via VTP pruning. The “trunk pruning vlan 1” option is not a valid command.

 

 

QUESTION 86

Which VLAN range is eligible to be pruned when a network engineer enables VTP pruning on a switch?

 

A.

VLANs 1-1001

B.

VLANs 1-4094

C.

VLANs 2-1001

D.

VLANs 2-4094

 

Correct Answer: C

Explanation:

VTP pruning should only be enabled on VTP servers, all the clients in the VTP domain will automatically enable VTP pruning. By default, VLANs 2 ?1001 are pruning eligible, but VLAN 1 can’t be pruned because it’s an administrative VLAN. Both VTP versions 1 and 2 supports pruning.

Reference: http://www.orbit-computer-solutions.com/VTP-Pruning.php

 

 

QUESTION 87

What is the maximum number of VLANs that can be assigned to an access switchport without a voice VLAN?

 

A.

0

B.

1

C.

2

D.

1024

 

Correct Answer: B

Explanation:

A standard (non-voice VLAN port) access switch port can belong to only a single VLAN. If more than one VLAN is needed, the port should be configured as a trunk port.

 

 

QUESTION 88

Which statement about the use of PAgP link aggregation on a Cisco switch that is running Cisco IOS Software is true?

 

A.

PAgP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable-desirable, and on-on allow the forma
tion of a channel.

B.

PAgP modes are active, desirable, and on. Only the combinations active-desirable, desirable-desirable, and on-on allow the formation of a channel.

C.

PAgP modes are active, desirable, and on. Only the combinations active-active, desirable-desirable, and on-on allow the formation of a channel.

D.

PAgP modes are off, active, desirable, and on. Only the combinations auto-auto, desirable-desirable, and on-on allow the formation of a channel.

 

Correct Answer: A

Explanation:

PAgP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable-desirable, and on-on will allow a channel to be formed.

The PAgP modes are explained below.

Only the combinations of auto-desirable, desirable-desirable, and on-on will allow a channel to be formed. If a device on one side of the channel does not support PAgP, such as a router, the device on the other side must have PAgP set to on.

Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-2900-xl-series-switches/21041-131.html

 

 

QUESTION 89

What is required for a LAN switch to support 802.1q Q-in-Q encapsulation?

 

A.

Support less than 1500 MTU

B.

Support 1504 MTU or higher

C.

Support 1522 layer 3 IP and IPX packet

D.

Support 1547 MTU only

 

Correct Answer: B

Explanation:

The default system MTU for traffic on Catalyst switches is 1500 bytes. Because the 802.1Q tunneling(Q-in-Q)feature increases the frame size by 4 bytes when the extra tag is added, you must configure all switches in the service-provider network to be able to process maximum frames by increasing the switch system MTU size to at least 1504 bytes.

Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_13_ea1 /configuration/guide/swtunnel.html

 

 

QUESTION 90

What happens on a Cisco switch that runs Cisco IOS when an RSTP-configured switch receives 802.1d BPDU?

 

A.

802.1d does not understand RSTP BPDUs because they are different versions, but when a RSTP switch receives an 802.1d BPDU, it responds with an802.1d BPDU and eventually the two switches run 802.1d to communicate.

B.

802.1d understands RSTP BPDUs because they are the same version, but when a RSTP switch receives a 802.1d BPDU, it responds with a 802.1d BPDU and eventually the two switches run 802.1d to communicate.

C.

802.1d does not understand RSTP BPDUs because they are different versions, but when a RSTP switch receives a 802.1d BPDU, it does not respond with a 802.1d BPDU.

D.

802.1d understands RSTP BPDUs because they are the same version, but when a RSTP switch receives a 802.1d BPDU, it does not respond with a 802.1d BPDU and eventually the two switches run 802.1d to communicate.

 

Correct Answer: A

Explanation:

For backward compatibility with 802.1D switches, RSTP selectively sends 802.1D configuration BPDUs and TCN BPDUs on a per-port basis. When a port is initialized, the migrate-delay timer is started (specifies the minimum time during which RSTP BPDUs are sent), and RSTP BPDUs are sent. While this timer is active, the switch processes all BPDUs received on that port and ignores the protocol type. If the switch receives an 802.1D BPDU after the port migration-delay timer has expired, it assumes that it is connected to an 802.1D switch and starts using only 802.1D BPDUs. However, if the RSTP switch is using 802.1D BPDUs on a port and receives an RSTP BP
DU after the timer has expired, it restarts the timer and starts using RSTP BPDUs on that port.

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

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