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642-813 Q&A – Implement VLAN based solution (71-76)

Section 1 – Implement VLAN based solution, given a network design and a set of requirements

QUESTION NO: 71
Which three items are configured in MST configuration submode? (Select three)
A. Region name
B. Configuration revision number
C. VLAN instance map
D. IST STP BPDU hello timer
E. CST instance map
F. PVST+ instance map

Answer: A,B,C
Explanation:
Spanning-tree mst configuration :
Use the spanning-tree mst configuration command to enter the MST configuration submode. Use the no form of this command to return to the default MST configuration.
Defaults:
The default value for the MST configuration is the default value for all its parameters: No VLANs are mapped to any MST instance (all VLANs are mapped to the CIST instance). The region name is an empty string. The revision number is 0.
Usage Guidelines:
The MST configuration consists of three main parameters: Instance VLAN mapping (see the instance command) Region name (see the name command) Configuration revision number (see the revision command)

QUESTION NO: 72
Switch R1 is configured to use the VLAN Trunking Protocol (VTP). What does R1 advertise in its VTP domain?
A. The VLAN ID of all known VLANs, the management domain name, and the total number of trunk links on the switch.
B. The VLAN ID of all known VLANs, a 1-bit canonical format (CF1 Indicator), and the switch configuration revision number.
C. The management domain name, the switch configuration revision number, the known VLANs, and their specific parameters.
D. A 2-byte TPID with a fixed value of 0x8100 for the management domain number, the switch configuration revision number, the known VLANs, and their specific parameters.
E. None of the other alternatives apply.
Answer: C
Explanation:
“Each switch participating in VTP advertises VLAN information, revision numbers, and VLAN parameters on its trunk ports to notify other switches in the management domain. VTP advertisements are sent as multicast frames. The switch intercepts frames sent to the VTP multicast address and processes them with its supervisory processor VTP frames are forwarded out trunk links as a special case.
The following global configuration information is distributed in VTP advertisements:
VLAN IDs (ISL and 802.1Q) Emulated LAN names (for ATM LANE ) 802.10 SAID values (FDDI)
VTP domain name VTP configuration revision number VLAN configuration, including maximum transmission unit (MTU) size for each VLAN Frame format
Incorrect Answers:
A: The total number of trunk links is not advertised.
B: A CFI is not advertised.
D: The TPID is not advertised. The value of 0x8100 is used to identify an 802.1Q trunking tag.

QUESTION NO: 73
What action should you execute if you wanted to enable VTP pruning on your entire management domain?
A. Enable VTP pruning on any client switch in the management domain.
B. Enable VTP pruning on any switch in the management domain.
C. Enable VTP pruning on every switch in the management domain.
D. Enable VTP pruning on a VTP server in the management domain.
E. Disable VTP pruning on a VTP server in the management domain.
Answer: D
Explanation:
Enabling VTP pruning on a VTP server allows pruning for the entire management domain.
Enabling this on the VTP server will mean that the VTP pruning configuration will be propagated to all VTP client switches within the domain. VTP pruning takes effect several seconds after you enable it. By default, VLANs 2 through 1000 are pruning-eligible.

QUESTION NO: 74
You need to design the VLAN scheme for the Company network. Which two statements are true about best practices in VLAN design? (Select two)
A. Routing should occur at the access layer ifvoice VLANs are utilized. Otherwise, routing should occur at the distribution layer.
B. Routing should always be performed at the distribution layer.
C. VLANs should be localized to a switch.
D. VLANs should be localized to a single switch unlessvoice VLANs are being utilized.
E. Routing should not be performed between VLANs located on separate switches.
Answer: B,C
Explanation:
In the distribution layer, uplinks from all access layer devices are aggregated, or come together.
The distribution layer switches must be capable of processing the total volume of traffic from all the connected devices. These switches should have a port density of high-speed links to support the collection of access layer switches.
VLANs and broadcast domains converge at the distribution layer, requiring routing, filtering, and security. The switches at this layer must be capable of performing multilayer switching with high throughput. Only certain Catalyst switch models can provide multilayer switching; be sure to understand which ones can do this.
A switched environment offers the technology to overcome flat network limitations. Switched networks can be subdivided into VLANs. By definition, a VLAN is a single broadcast domain. All devices connected to the VLAN receive broadcasts from other VLAN members. However, devices connected to a different VLAN will not receive those same broadcasts. (Naturally, VLAN members also receive unicast packets directed toward them from other VLAN members.)
A VLAN consists of defined members communicating as a logical network segment. In contrast, a physical segment consists of devices that must be connected to a physical cable segment. A
VLAN can have connected members located anywhere in the campus network, as long as VLAN connectivity is provided between all members. Layer 2 switches are configured with a VLAN mapping and provide the logical connectivity between the VLAN members.

QUESTION NO: 75
Refer to the exhibit. On the basis of the information provided in the exhibit, which two sets of procedures are best practices for Layer 2 and 3 failover alignment? (Choose two.)

image
A. Configure the D-SW1 switch as the active HSRP router and the STP root for all VLANs. Configure the D-SW2 switch as the standby HSRP router and backup STP root for all VLANs.
B. Configure the D-SW1 switch as the standby HSRP router and the STP root for VLANs 11 and 110. Configure the D-SW2 switch as the standby HSRP router and the STP root for VLANs 12 and 120.
C. Configure the D-SW1 switch as the active HSRP router and the STP root for VLANs 11 and 110. Configure the D-SW2 switch as the active HSRP router and the STP root for VLANs 12 and 120.
D. Configure the D-SW2 switch as the active HSRP router and the STP root for all VLANs. Configure the D-SW1 switch as the standby HSRP router and backup STP root for all VLANs.
E. Configure the D-SW1 switch as the active HSRP router and the backup STP root for VLANs 11 and 110. Configure the D-SW2 switch as the active HSRP router and the backup STP root for VLANs 12 and 120.
F. Configure the D-SW1 switch as the standby HSRP router and the backup STP root for VLANs 12a nd 120. Configure the D-SW2 switch as the standby HSRP router and the backup STP root for VLANs 11 and 110.
Answer: C,F
Explanation:
Basically, each of the routers that provides redundancy for a given gateway address is assigned to a common HSRP group. One router is elected as the primary, or active, HSRP router, another is elected as the standby HSRP router, and all the others remain in the listen HSRP state. The routers exchange HSRP hello messages at regular intervals, so they can remain aware of each other’s existence, as well as that of the active router.
HSRP election is based on a priority value (0 to 255) that is configured on each router in the group. By default, the priority is 100. The router with the highest priority value (255 is highest) becomes the active router for the group. If all router priorities are equal or set to the default value, the router with the highest IP address on the HSRP interface becomes the active router. To set the priority, use the following interface configuration command:

Switch( config-if)# standby group priority priority

When HSRP is configured on an interface, the router progresses through a series of states before becoming active. This forces a router to listen for others in a group and see where it fits into the pecking order. The HSRP state sequence is Disabled, Init, Listen, Speak, Standby, and, finally, Active.
You can configure a router to preempt or immediately take over the active role if its priority is the highest at any time. Use the following interface configuration command to allow preemption:

Switch( config-if)# standby group preempt [delay seconds]

QUESTION NO: 76
When the Catalyst switch R1 is enabled to use VTP, which information does it advertise on its trunk ports? (Select two)
A. VTP mode
B. STP root status
C. Negotiation status
D. Management domain
E. Configuration revision number
Answer: D,E
Explanation:
The VTP protocol maintains VLAN configuration consistency throughout the network by distributing VLAN information to the network. VLAN information is sent to network devices in advertisements that contain the VTP management domain name, the current configuration revision number, the VLANs that the server knows about, and certain VLAN parameters. Any time you change a VLAN, VTP automatically sends an advertisement to update all other network devices.
The following global configuration information is distributed in VTP advertisements:
VLAN IDs (ISL and 802.1Q) Emulated LAN names (for ATM LANE) 802.10 SAID values (FDDI)
VTP domain name VTP configuration revision number VLAN configuration, including maximum transmission unit (MTU) size for each VLAN Frame format.

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