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After UDLD is implemented, a Network Administrator noticed that one port stops receiving UDLD packets. This port continues to reestablish until after eight failed retries. The port then transitions into the errdisable state. Which option describes what causes the port to go into the errdisable state?
A. Normal UDLD operations that prevent traffic loops.
B. UDLD port is configured in aggressive mode.
C. UDLD is enabled globally.
D. UDLD timers are inconsistent.
Correct Answer: B
With UDLD aggressive mode enabled, when a port on a bidirectional link that has a UDLD neighbor relationship established stops receiving UDLD packets, UDLD tries to reestablish the connection with the neighbor. After eight failed retries, the port is disabled. Reference: http://www.cisco.com/c/en/us/td/docs/ switches/lan/ catalyst6500/ios/12- 2SX/configuration/guide/book/udld.html
A network engineer must adjust the STP interface attributes to influence root port selection. Which two elements are used to accomplish this? (Choose two.)
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
A network engineer is extending a LAN segment between two geographically separated data centers. Which enhancement to a spanning-tree design prevents unnecessary traffic from crossing the extended LAN segment?
A. Modify the spanning-tree priorities to dictate the traffic flow.
B. Create a Layer 3 transit VLAN to segment the traffic between the sites.
C. Use VTP pruning on the trunk interfaces.
D. Configure manual trunk pruning between the two locations.
Correct Answer: C
Pruning unnecessary VLANs from the trunk can be performed with one of two methods:
Manual pruning of the unnecessary VLAN on the trunk–This is the best method, and it avoids the use of the spanning tree. Instead, the method runs the pruned VLAN on trunks.
VTP pruning–Avoid this method if the goal is to reduce the number of STP instances. VTP- pruned VLANs on a trunk are still part of the spanning tree. Therefore, VTP-pruned VLANs do not reduce the number of spanning tree port instances.
Since the question asked for the choice that is an enhancement to the STP design, VTP pruning is the best choice.
What is the maximum number of VLANs that can be assigned to an access switchport without a voice VLAN?
Correct Answer: B
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.
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?
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
What is the maximum number of 10 Gigabit Ethernet connections that can be utilized in an EtherChannel for the virtual switch link?
Correct Answer: C
The VSS is made up of the following:
Virtual switch members: Cisco Catalyst 6500 Series Switches (up to two switches with initial release) deployed with the Virtual Switching Supervisor 720 10GE
Virtual switch link (VSL): 10 Gigabit Ethernet connections (up to eight using EtherChannel) between the virtual switch members.
Which portion of AAA looks at what a user has access to?
Correct Answer: A
AAA consists of the following three elements:
Authentication: Identifies users by login and password using challenge and response methodology before the user even gains access to the network. Depending on your security options, it can also support encryption. Authorization: After
initial authentication, authorization looks at what that authenticated user has access to do. RADIUS or TACACS security servers perform authorization for specific privileges by defining attribute-value (AV) pairs, which would be specific to the
individual user rights. In the Cisco IOS, you can define AAA
authorization with a named list or authorization method.
Accounting: The last “A” is for accounting. It provides a way of collecting security information that you can use for billing, auditing, and reporting. You can use accounting to see what users do once they are authenticated and authorized. For
example, with accounting, you could get a log of when users logged in and when they logged out.
Reference: http://www.techrepublic.com/blog/data-center/what-is-aaa-and-how-do-you- configure-it-in-the- cisco-ios/
Refer to the exhibit.
An engineer is configuring EtherChannel between two switches and notices the console message on switch 2. Based on the output, which option describes the reason for this error?
A. Switch 1 does not have enough member ports configured.
B. Switch 2 has too many member ports configured
C. The port channel interface numbers do not match.
D. The EtherChannel protocols do not match.
Correct Answer: D
Which two statements about HSRP, GLBP, and VRRP are true? (Choose two.)
A. HSRP is the preferred protocol to be used on multivendor environments.
B. VRRP has one master router, one standby router, and many listening routers.
C. GLBP allows for a maximum of four MAC addresses per group.
D. HSRP supports up to 255 groups on the same switch or router.
E. VRRP is a Cisco proprietary protocol.
Correct Answer: CD
In regards to Cisco Virtual Switching System ,which technology is needed between two switches for them to act as one network element and share control information and data traffic?
C. Virtual Switch Link
D. virtual port channel
Correct Answer: C
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