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Question 1:

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 2:

Which two protocols can be automatically negotiated between switches for trunking? (Choose two.)

A. PPP

B. DTP

C. ISL

D. HDLC

E. DLCI

F. DOT1Q

Correct Answer: CF

Switches such as the Catalyst 3550 that are capable of either 802.1Q or ISL trunking encapsulation, the switchport trunk encapsulation [dot1q | isl | negotiate] interface command must be used prior to the switchport mode trunk command. Reference: https://learningnetwork.cisco.com/servlet/JiveServlet/ previewBody/14792-102-1- 57313/ Dynamic Trunking Protocol.PDF


Question 3:

Refer to the exhibit.

The users in an engineering department that connect to the same access switch cannot access the network. The network engineer found that the engineering VLAN is missing from the database. Which action resolves this problem?

A. Disable VTP pruning and disable 802.1q.

B. Update the VTP revision number.

C. Change VTP mode to server and enable 802.1q.

D. Enable VTP pruning and disable 802.1q.

Correct Answer: C

Only VTP servers can add new VLANs to the switched network, so to enable vlan 10 on this switch you will first need to change the VTP mode from client to server. Then, you will need to enable 802.1Q trunking to pass this new VLAN along to the other switches.


Question 4:

A network engineer configured a fault-tolerance link on Gigabit Ethernet links G0/1, G0/2, G0/3, and G0/4 between two switches using Ethernet port-channel. Which action allows interface G0/1 to always actively forward traffic in the port-channel?

A. Configure G0/1 as half duplex and G0/2 as full duplex.

B. Configure LACP port-priority on G0/1 to 1.

C. Configure LACP port-priority on G0/1 to 65535.

D. LACP traffic goes through G0/4 because it is the highest interface ID.

Correct Answer: B

A LACP port priority is configured on each port using LACP. The port priority can be configured automatically or through the CLI. LACP uses the port priority with the port number to form the port identifier. The port priority determines which

ports should be put in standby mode when there is a hardware limitation that prevents all compatible ports from aggregating. The higher the number, the lower the priority. The valid range is from 1 to 65535. The default is 32768.

Reference:

http://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/gigeth.html#wp1081491


Question 5:

Refer to the exhibit.

Which statement about switch S1 is true?

A. Physical port Fa0/13, Fa0/14, and Fa0/15 successfully formed a Layer 2 port-channel interface using an open standard protocol.

B. Logical port Fa0/13, Fa0/14, and Fa0/15 successfully formed a Layer 2 physical port-channel interface using a Cisco proprietary protocol.

C. Physical port Fa0/13, Fa0/14, and Fa0/15 successfully formed a Layer 3 port-channel interface using a Cisco proprietary protocol.

D. Logical port Fa0/13, Fa0/14, and Fa0/15 successfully formed a Layer 3 physical port-channel interface using an open standard protocol.

Correct Answer: A

These three ports show that they are in Port Channel 1, and the (SU) means they are in use and operating at layer 2. The protocol used for this port channel shows as LACP, which is a standards based protocol, as opposed to PAgP, which is Cisco proprietary.


300-115 VCE Dumps300-115 Practice Test300-115 Exam Questions

Question 6:

When two MST instances (MST 1 and MST 2) are created on a switch, what is the total number of spanning-tree instances running on the switch?

A. 1

B. 2

C. 3

D. 4

Correct Answer: C

Unlike other spanning tree protocols, in which all the spanning tree instances are independent, MST establishes and maintains IST, CIST, and CST spanning trees:

An IST is the spanning tree that runs in an MST region.

Within each MST region, MST maintains multiple spanning tree instances. Instance 0 is a special instance for a region, known as the IST. All other MST instances are numbered from 1 to 4094. In the case for this question, there will be the 2

defined MST instances, and the special 0 instance, for a total of 3 instances. The IST is the only spanning tree instance that sends and receives BPDUs. All of the other span- ning tree instance information is contained in MSTP records (M-

records), which are encapsu- lated within MST BPDUs. Because the MST BPDU carries information for all instances, the number of BPDUs that need to be processed to support multiple spanning tree instances is signifi- cantly reduced. All

MST instances within the same region share the same protocol timers, but each MST in- stance has its own topology parameters, such as root bridge ID, root path cost, and so forth. By default, all VLANs are assigned to the IST. An MST

instance is local to the region; for example, MST instance 1 in region A is independent of MST instance 1 in region B, even if regions A and B are interconnected.

A CIST is a collection of the ISTs in each MST region.

The CST interconnects the MST regions and single spanning trees.

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


Question 7:

Refer to the exhibit.

Why would the switch be considered as a root bridge?

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

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/config uration/ guide/swstp.html#wp1020666


Question 8:

The command storm-control broadcast level 75 65 is configured under the switch port connected to the corporate mail server. In which three ways does this command impact the traffic? (Choose three.)

A. SNMP traps are sent by default when broadcast traffic reaches 65% of the lower-level threshold.

B. The switchport is disabled when unicast traffic reaches 75% of the total interface bandwidth.

C. The switch resumes forwarding broadcasts when they are below 65% of bandwidth.

D. Only broadcast traffic is limited by this particular storm control configuration.

E. Multicast traffic is dropped at 65% and broadcast traffic is dropped at 75% of the total interface bandwidth.

F. The switch drops broadcasts when they reach 75% of bandwidth.

Correct Answer: CDF

storm-control {broad- Configure broadcast, multicast, or unicast storm control. By de- cast | multicast | uni- fault, storm control is disabled.

cast} level {level [lev-

The keywords have these meanings:

el-low] | pps pps [pps-low]}

For level, specify the rising threshold level for broadcast, multicast, or unicast traffic as a percentage (up to two decimal places) of the bandwidth. The port blocks traffic when the rising threshold is reached. The range is 0.00 to 100.00.

(Optional) For level-low, specify the falling threshold level as a percentage (up to two decimal places) of the bandwidth. This value must be less than or equal to the rising suppression value. The port forwards traffic when traffic drops below

this level. If you do not configure a falling suppression level, it is set to the rising suppression level. The range is 0.00 to 100.00.

In this case, the broadcast keyword was used so only broadcast traffic is limited. Reference: http:// www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/ software/release/12- 2_25_see/configuration/ guide/3550SCG/swtrafc.html


Question 9:

On which interface can port security be configured?

A. static trunk ports

B. destination port for SPAN

C. EtherChannel port group

D. dynamic access point

Correct Answer: A

Port Security and Port Types

You can configure port security only on Layer 2 interfaces. Details about port security and different types of interfaces or ports are as follows:

Access ports–You can configure port security on interfaces that you have configured as Layer 2 access ports. On an access port, port security applies only to the access VLAN. Trunk ports–You can configure port security on interfaces that

you have configured as Layer 2 trunk ports. VLAN maximums are not useful for access ports. The device allows VLAN maximums only for VLANs associated with the trunk port.

SPAN ports–You can configure port security on SPAN source ports but not on SPAN destination ports.

Ethernet Port Channels–Port security is not supported on Ethernet port channels. 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


Question 10:

Which First Hop Redundancy Protocol is an IEEE Standard?

A. GLBP

B. HSRP

C. VRRP

D. OSPF

Correct Answer: C

A comparison of the three First Hop Redundancy Protocols are listed below: GLBP HSRP VRRP Protocol (Gateway Load (Hot Standby Router (Virtual Redundancy Features Balancing Pro-protocol) Router Protocol) tocol) 1 AVG (Ac-tive Virtual Gateway).- up to 4 AVF routers on the 1 active router.- 1 group (Active -1 master router.- 1 standby router.- 1 or Virtual For-or more backup more listening warder) passing routers. routers. traffic.- up to Router role 1024 virtual routers (GLBP groups) per physical inter-face. -Can use real router -Use virtual ip ad- ip address, if not, the – Use virtual ip dress. one with highest pri- address. ority become master. Cisco propri-Scope Cisco proprietary IEEE standard etary Active Virtual Active Router: Master Router: (*) Gateway: 1-Highest Priority 1-Highest Priority 1-Highest Pri-Election 2-Highest IP 2-Highest IP ority (tiebreaker) (tiebreaker) 2-Highest IP (tiebreaker) Tracking yes yes yes Optimization Preempt yes yes yes features Timer ad-yes yes yes justments Traffic type 224.0.0.2 udp 1985 224.0.0.18 IP 112 224.0.0.102 udp (version1) 3222 224.0.0.102-udp 1985 (version2) Advertisement 1 Hello 3 sec-Hello 3 seconds second onds (Master Down Inter-Timers val)3 * Advertisement (Hold) 10 sec- skew time (Hold) 10 seconds onds (Skew time)(256-pri-ority) / 256 Load-balancing oriented-Weighted algo- -Multiple HSRP – Multiple VRRP rithm.- Host-degroup per in- group per in-pendent algo-terface/SVI/routed terface/SVI/routed rithm. int. int. -Round-Robin algorithm (de-fault). Load-balancing functional-Clients are ity transparently updated with Requires appropriate Requires appropriate virtual MAC distribution of Virtual distribution of Virtual according to GW IP per Clients for GW IP per Clients for load-balancing optimal load-balanc- optimal load- balanc- algorithm ing.(generally through ing.(generally through through ARP DHCP) DHCP) requesting a unique virtual gateway. Reference: http:// cciethebeginning.wordpress.com/2008/08/23/router-high- availability-protocol- comparison-2/


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