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Cisco CCNP SWITCH 642-813 Exam Questions with Explanation – Chapter 1(11-15)

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

In the three-layer hierarchical network design model; what’s associated with the access layer? (Select two)
A. optimized transport structure
B. high port density
C. boundary definition
D. data encryption
E. local VLANs
F. route summaries
Answer: B,E
The access layer is the outermost layer, and it is composed of the least sophisticated network equipment. The most important function of the access layer is high port density, since these devices connect the individual end users. The access layers are also where VLANs are implemented, since VLANs are assigned on a per-port basis.

You are assigning VLANs to the ports of switch R1. What VLAN number value is an assigned to the default VLAN?
A. VLAN 1003
Answer: B
Explanation: The default VLAN is VLAN 1. Although this VLAN can be modified, it can not be deleted from the switch. The following VLANs are on by default for all Cisco Catalyst switches: VLAN 1 – Default VLAN VLAN 1002 – Default FDDI VLAN VLAN 1003 – Default Token Ring VLAN VLAN 1004 – Default FDDI Net VLAN VLAN 1005 – Default Token Ring Net VLAN

The VLANs in switch R1 are being modified. Which of the following are updated in R1 every time a VLAN is modified? (Select all that apply)
A. Configuration revision number
B. Configuration revision flag field
C. Configuration revision reset switch
D. Configuration revision database
E. None of the other alternatives apply.
Answer: A,D
For accountability reasons, every time a VLAN is modified the revision number changes, as does the information in the configuration revision database (as that is where the VLAN information is stored).

Given the above partial configuration, which two statements are true about VLAN traffic? (Choose two.)
A. VLANs 1-5 will use fa0/10 as a backup only.
B. VLANs 6-10 will use fa0/10 as a backup only.
C. VLANs 1-5 will be blocked if fa0/10 goes down.
D. VLANs 1-10 are configured to load share between fa0/10 and fa0/12.
E. VLANs 6-10 have a port priority of 128 on fa0/10.
Answer: B,D
Spanning-Tree Protocol (STP) is a Layer 2 protocol that utilizes a special-purpose algorithm to discover physical loops in a network and effect a logical loop-free topology. STP creates a loop-free tree structure consisting of leaves and branches that span the entire Layer 2 network. The actual mechanics of how bridges communicate and how the STP algorithm works will be discussed at length in the following topics. Note that the terms bridge and switch are used interchangeably when discussing STP. In addition, unless otherwise indicated, connections between switches are assumed to be trunks.
Load sharing can be accomplished using a couple of methods. The most common method of load sharing is through root bridge placement on a per-VLAN basis. This will distribute traffic for separate VLANs across separate paths to different root bridges. A separate method divides the bandwidth supplied by parallel trunks connecting switches. To avoid loops, STP normally blocks all but one parallel link between switches. Using load sharing, traffic can be divided between the links according to which VLAN the traffic belongs. Load sharing can be configured on trunk ports by using STP port priorities or STP path costs. For load sharing using STP port priorities, both load-sharing links must be connected to the same switch. For load sharing using STP path costs, each load-sharing link can be connected to the same switch or to two different switches.
Load Sharing Using STP Port Priorities
When two ports on the same switch form a loop, the STP port priority setting determines which port is enabled and which port is in a blocking state. The priorities on a parallel trunk port can be set so that the port carries all the traffic for a given VLAN. The trunk port with the higher priority (lower values) for a VLAN is forwarding traffic for that VLAN. The trunk port with the lower priority (higher values) for the same VLAN remains in a Blocking state for that VLAN. One trunk port sends or receives all traffic for the VLAN.

What is a characteristic of a static VLAN membership assignment?
A. VMPS server lookup is required
B. Easy to configure
C. Easy of adds, moves, and changes
D. Based on MAC address of the connected device
Answer: B Explanation:
Static port VLAN membership on the switch is assigned manually by the administrator on a port?by-port basis. Characteristics of static VLAN configurations include the following:
Easy to configure
Straight forward to monitor
Works well in networks where moves, adds, and changes are rare.

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