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Question 1:

After the implementation of several different types of switches from different vendors, a network engineer notices that directly connected devices that use Cisco Discovery Protocol are not visible. Which vendor- neutral protocol could be used to resolve this issue?

A. Local Area Mobility

B. Link Layer Discovery Protocol

C. NetFlow

D. Directed Response Protocol

Correct Answer: B

The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol in the Internet Protocol Suite used by network devices for advertising their identity, capabilities, and neighbors on an IEEE 802 local area network, principally wired Ethernet. LLDP performs functions similar to several proprietary protocols, such as the Cisco Discovery Protocol (CDP). Reference: http://en.wikipedia.org/wiki/ Link_Layer_Discovery_Protocol

Question 2:

Which SDM template is the most appropriate for a Layer 2 switch that provides connectivity to a large number of clients?

A. VLAN

B. default

C. access

D. routing

Correct Answer: A

To allocate ternary content addressable memory (TCAM) resources for different usages, the switch SDM templates prioritize system resources to optimize support for certain features. You can select SDM templates to optimize these features:

Access–The access template maximizes system resources for access control lists (ACLs) to accommodate a large number of ACLs. Default–The default template gives balance to all functions. Routing–The routing template maximizes

system resources for IPv4 unicast routing, typically required for a router or aggregator in the center of a network.

VLANs–The VLAN template disables routing and supports the maximum number of unicast MAC addresses (clients). It would typically be selected for a Layer 2 switch.

Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/ release/12.2_55_se/config uration/guide/swsdm.pdf

Question 3:

In a Cisco switch, what is the default period of time after which a MAC address ages out and is discarded?

A. 100 seconds

B. 180 seconds

C. 300 seconds

D. 600 seconds

Correct Answer: C

To configure the aging time for all MAC addresses, perform this task:

Command Purpose

Step 1 switch# configure ter- Enters configuration mode.

minal

Step 2 switch(config)# mac-ad- Specifies the time before an entry ages out and is dis- dress-table aging- time carded from the MAC address table. The range is from seconds [vlan vlan_id] 0 to 1000000; the default is 300 seconds. Entering

the value 0 disables the MAC aging. If a VLAN is not specified, the aging specification applies to all VLANs.

Reference:

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/M ACAddress.html

Question 4:

Which VTP mode is needed to configure an extended VLAN, when a switch is configured to use VTP versions 1 or 2?

A. transparent

B. client

C. server

D. Extended VLANs are only supported in version 3 and not in versions 1 or 2.

Correct Answer: A

Question 5:

Which feature must be enabled to eliminate the broadcasting of all unknown traffic to switches that are not participating in the specific VLAN?

A. VTP pruning

B. port-security

C. storm control

D. bpdguard

Correct Answer: A

Explanation: VTP ensures that all switches in the VTP domain are aware of all VLANs. However, there are occasions when VTP can create unnecessary traffic. All unknown unicasts and broadcasts in a VLAN are flooded over the entire VLAN. All switches in the network receive all broadcasts, even in situations in which few users are connected in that VLAN. VTP pruning is a feature that you use in order to eliminate or prune this unnecessary traffic. Reference: http:// www.cisco.com/c/ en/us/ support/docs/lan-switching/vtp/10558- 21.html#vtp_pruning

300-115 VCE Dumps300-115 Study Guide300-115 Exam Questions

Question 6:

A network engineer must implement Ethernet links that are capable of transporting frames and IP traffic for different broadcast domains that are mutually isolated. Consider that this is a multivendor environment. Which Cisco IOS switching feature can be used to achieve the task?

A. PPP encapsulation with a virtual template

B. Link Aggregation Protocol at the access layer

C. dot1q VLAN trunking

D. Inter-Switch Link

Correct Answer: C

Here the question asks for transporting “frames and IP traffic for different broadcast domains that are mutually isolated” which is basically a long way of saying VLANs so trunking is needed to carry VLAN information. There are 2 different methods for trunking, 802.1Q and ISL. Of these, only 802.1Q is supported by multiple vendors since ISL is a Cisco proprietary protocol.

Question 7:

Which statement about using native VLANs to carry untagged frames is true?

A. Cisco Discovery Protocol version 2 carries native VLAN information, but version 1 does not.

B. Cisco Discovery Protocol version 1 carries native VLAN information, but version 2 does not.

C. Cisco Discovery Protocol version 1 and version 2 carry native VLAN information.

D. Cisco Discovery Protocol version 3 carries native VLAN information, but versions 1 and 2 do not.

Correct Answer: A

Cisco Discovery Protocol (CDP) version 2 passes native VLAN information between Cisco switches. If you have a native VLAN mismatch, you will see CDP error messages on the console output. Reference: http://www.ciscopress.com/articles/article.asp?p=29803andseqNum=3

Question 8:

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

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 9:

Refer to the exhibit.

How many bytes are added to each frame as a result of the configuration?

A. 4-bytes except the native VLAN

B. 8-bytes except the native VLAN

C. 4-bytes including native VLAN

D. 8-bytes including native VLAN

Correct Answer: A

In 802.1Q trunking, all VLAN packets are tagged on the trunk link, except the native VLAN. A VLAN tag adds 4 bytes to the frame. Two bytes are used for the tag protocol identifier (TPID), the other two bytes for tag control information (TCI).

Question 10:

Which statement describes what happens when a port configured with root guard receives a superior BPDU?

A. The port goes into errdisabled state and stops forwarding traffic.

B. The port goes into BPDU-inconsistent state and stops forwarding traffic.

C. The port goes into loop-inconsistent state and stops forwarding traffic.

D. The port goes into root-inconsistent state and stops forwarding traffic.

Correct Answer: D

Explanation: The root guard ensures that the port on which root guard is enabled is the designated port. Normally, root bridge ports are all designated ports, unless two or more ports of the root bridge are connected together. If the bridge receives superior STP Bridge Protocol Data Units (BPDUs) on a root guard- enabled port, root guard moves this port to a root-inconsistent STP state. This root-inconsistent state is effectively equal to a listening state. No traffic is forwarded across this port. In this way, the root guard enforces the position of the root bridge. Reference: http://www.cisco.com/en/US/tech/tk389/tk621/ technologies_tech_note09186a00800ae96b.shtml

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