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Question 1:

What percentage of bandwidth is reduced when a stack cable is broken?

A. 0

B. 25

C. 50

D. 75

E. 100

Correct Answer: C

Physical Sequential Linkage The switches are physically connected sequentially, as shown in Figure 3. A break in any one of the cables will result in the stack bandwidth being reduced to half of its full capacity. Subsecond timing mechanisms detect traffic problems and immediately institute failover. This mechanism restores dual path flow when the timing mechanisms detect renewed activity on the cable. Figure 3. Cisco StackWise Technology Resilient Cabling

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series- switches/ prod_white_paper09186a00801b096a.html

Question 2:

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 3:

After the recent upgrade of the switching infrastructure, the network engineer notices that the port roles that were once “blocking” are now defined as “alternate” and “backup.” What is the reason for this change?

A. The new switches are using RSTP instead of legacy IEEE 802.1D STP.

B. IEEE 802.1D STP and PortFast have been configured by default on all newly implemented Cisco Catalyst switches.

C. The administrator has defined the switch as the root in the STP domain.

D. The port roles have been adjusted based on the interface bandwidth and timers of the new Cisco Catalyst switches.

Correct Answer: A

RSTP works by adding an alternative port and a backup port compared to STP. These ports are allowed to immediately enter the forwarding state rather than passively wait for the network to converge. RSTP bridge port roles: Root port A forwarding port that is the closest to the root bridge in terms of path cost Designated port A forwarding port for every LAN segment Alternate port A best alternate path to the root bridge. This path is different than using the root port. The alternative port moves to the forwarding state if there is a failure on the designated port for the segment. Backup port A backup/redundant path to a segment where another bridge port already connects. The backup port applies only when a single switch has two links to the same segment (collision domain). To have two links to the same collision domain, the switch must be attached to a hub. Disabled port Not strictly part of STP, a network administrator can manually disable a port Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/ spanning-tree- protocol/24062-146.html

Question 4:

After reviewing UDLD status on switch ports, an engineer notices that the.” Which statement describes what this indicates about the status of the port?

A. The port is fully operational and no known issues are detected.

B. The bidirectional status of “unknown” indicates that the port will go into the disabled state because it stopped receiving UDLD packets from its neighbor.

C. UDLD moved into aggressive mode after inconsistent acknowledgements were detected.

D. The UDLD port is placed in the “unknown” state for 5 seconds until the next UDLD packet is received on the interface.

Correct Answer: A

By default, UDLD is disabled on all interfaces. We can enable UDLD globally on the device, or individually on specific interfaces with the command udld port. This enables UDLD in normal mode. It would be prohibitively difficult to coordinate

the configuration of UDLD on both ends of a link at the same time, so when UDLD is first enabled and does not detect a neighbor the link state is considered unknown, which is not necessarily an error condition. The port will remain

operational during this time. When UDLD is finally enabled on the other end, the status will transition to bidirectional.

Reference: http://packetlife.net/blog/2011/mar/7/udld/

Question 5:

A network engineer must adjust the STP interface attributes to influence root port selection. Which two elements are used to accomplish this? (Choose two.)

A. port-priority

B. cost

C. forward-timers

D. link type

E. root guard

Correct Answer: AB

Explanation: Spanning tree forces redundant data paths into a standby (blocked) state. If a network segment in the spanning tree fails and a redundant path exists, the spanning-tree algorithm recalculates the spanning-tree topology and activates the standby path. Switches send and receive spanning-tree frames, called bridge protocol data units (BPDUs), at regular intervals. The switches do not forward these frames but use them to construct a loop-free path. BPDUs contain information about the sending switch and its ports, including switch and MAC addresses, switch priority, port priority, and path cost. Spanning tree uses this information to elect the root switch and root port for the switched network and the root port and designated port for each switched segment. When two ports on a switch are part of a loop, the spanning-tree port priority and path cost settings control which port is put in the forwarding state and which is put in the blocking state. The spanning-tree port priority value represents the location of a port in the network topology and how well it is located to pass traffic. The path cost value represents the media speed. Reference: http://www.cisco.com/c/en/us/td/docs/ switches/lan/catalyst3750x_3560x/software/ release/12- 2_55_se/configuration/ guide/3750xscg/swstp.html

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

Question 6:

Which technique allows specific VLANs to be strictly permitted by the administrator?

A. VTP pruning

B. transparent bridging

C. trunk allowed VLANs

D. VLAN access-list

E. L2P tunneling

Correct Answer: C

By default, a trunk port sends traffic to and receives traffic from all VLANs. All VLAN IDs, 1 to 4094, are allowed on each trunk. However, you can remove VLANs from the allowed list, preventing traffic from those VLANs from passing over the

trunk. To restrict the traffic a trunk carries, use the “switchport trunk allowed vlan remove vlan-list” interface configuration command to remove specific VLANs from the allowed list.

Reference:

http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_13_ea1/confi guration/ guide/swvlan.html

Question 7:

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

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

Question 8:

Refer to the exhibit.

Which EtherChannel negotiation protocol is configured on the interface f0/13 f0/15?

A. Link Combination Control Protocol

B. Port Aggregation Protocol

C. Port Combination Protocol

D. Link Aggregation Control Protocol

Correct Answer: B

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. .

1.

on: PAgP will not run. The channel is forced to come up.

2.

off: PAgP will not run. The channel is forced to remain down.

3.

auto: PAgP is running passively. The formation of a channel is desired; however, it is not initiated.

4.

desirable: PAgP is running actively. The formation of a channel is desired and ini- tiated. The Link Aggregate Control Protocol (LACP) trunking supports four modes of operation:

On: The link aggregation is forced to be formed without any LACP negotiation .In other words, the switch neither sends the LACP packet nor processes any inbound LACP packet. This is similar to the on state for PAgP.

Off: The link aggregation is not formed. We do not send or understand the LACP packet.

This is similar to the off state for PAgP.

Passive: The switch does not initiate the channel but does understand inbound LACP packets. The peer (in active state) initiates negotiation (when it sends out an LACP packet) which we receive and answer, eventually to form the

aggregation channel with the peer. This is similar to the auto mode in PAgP.

Active: We can form an aggregate link and initiate the negotiation. The link aggregate is formed if the other end runs in LACP active or passive mode. This is similar to the desir- able mode of PAgP. In this example, we see that fa 0/13, fa0/14, and fa0/15 are all in Port Channel 12, which is operating in desirable mode, which is only a PAgP mode.

Question 9:

A Cisco Catalyst switch that is prone to reboots continues to rebuild the DHCP snooping database. What is the solution to avoid the snooping database from being rebuilt after every device reboot?

A. A DHCP snooping database agent should be configured.

B. Enable DHCP snooping for all VLANs that are associated with the switch.

C. Disable Option 82 for DHCP data insertion.

D. Use IP Source Guard to protect the DHCP binding table entries from being lost upon rebooting.

E. Apply ip dhcp snooping trust on all interfaces with dynamic addresses.

Correct Answer: A

Minimum DHCP Snooping Configuration

The minimum configuration steps for the DHCP snooping feature are as follows:

1.Define and configure the DHCP server.

2. Enable DHCP snooping on at least one VLAN.

By default, DHCP snooping is inactive on all VLANs.

3.Ensure that DHCP server is connected through a trusted interface. By default, the trust state of all interfaces is untrusted. 4.Configure the DHCP snooping database agent. This step ensures that database entries are restored after a restart

or switchover. 5.Enable DHCP snooping globally. The feature is not active until you complete this step.

Reference:

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/sno odhcp.html#wp1090479

Question 10:

A network engineer configures port security and 802.1x on the same interface. Which option describes what this configuration allows?

A. It allows port security to secure the MAC address that 802.1x authenticates.

B. It allows port security to secure the IP address that 802.1x authenticates.

C. It allows 802.1x to secure the MAC address that port security authenticates.

D. It allows 802.1x to secure the IP address that port security authenticates.

Correct Answer: A

Explanation: 802.1X and Port Security You can configure port security and 802.1X on the same interfaces. Port security secures the MAC addresses that 802.1X authenticates. 802.1X processes packets before port security processes them, so when you enable both on an interface, 802.1X is already preventing inbound traffic on the interface from unknown MAC addresses. Reference: http://www.cisco.com/c/en/us/ td/docs/switches/datacenter/sw/4_1/nx- os/security/ configuration/ guide/sec_nx-os-cfg/sec_portsec.html

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