Which three statements&#81...

多项选择题Which three statements about STP timers are true？（）

A.STP timers values （hello， forward delay， max age） are included in each BPDU.
B.A switch is not concerned about its local configuration of the STP timers values. It will only consider the value of the STP timers contained in the BPDU it is receiving.
C.To successfully exchange BPDUs between two switches， their STP timers value （hello， forward delay， max age） must be the same.
D.If any STP timer value （hello， forward delay， max age） needs to be changed， it should at least be changed on the root bridge and backup root bridge.
E.On a switched network with a small network diameter， the STP hello timer can be tuned to a lower value to decrease the load on the switch CPU.
F.The root bridge passes the timer information in BPDUs to all routers in the Layer 3 configuration.

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1.单项选择题 Examine the diagram. A network administrator has recently installed the above switched network using 3550s and would like to control the selection of the root bridge.
Which switch should theadministrator configure as the root bridge and which configuration command must theadministrator enter to accomplish this？（）

A.DSW11（config）# spanning-tree vlan 1 priority 4096
B.DSW12（config）# set spanning-tree priority 4096
C.ASW13（config）# spanning-tree vlan 1 priority 4096
D.DSW11（config）# set spanning-tree priority 4096
E.DSW12（config）# spanning-tree vlan 1 priority 4096
F.ASW13（config）# set spanning-tree priority 4096

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2.多项选择题 Given the above diagram and assuming that STP is enabled on all switch devices，
which two statements are true？（）

A.DSW11 will be elected the root bridge.
B.DSW12 will be elected the root bridge.
C.ASW13 will be elected the root bridge.
D.P3/1 will be elected the nondesignated port.
E.P2/2 will be elected the nondesignated port.
F.P3/2 will be elected the nondesignated port.

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3.多项选择题Which two statements concerning STP state changes are true？（）

A.Upon bootup，a port transitions from blocking to forwarding because it assumes itself as root.
B.Upon bootup，a port transitions from blocking to listening because it assumes itself as root.
C.Upon bootup，a port transitions from listening to forwarding because it assumes itself as root.
D.If a forwarding port receives no BPDUs by the max_age time limit， it will transition to listening.
E.If a forwarding port receives an inferior BPDU， it will transition to listening.
F.If a blocked port receives no BPDUs by the max_age time limit， it will transition to listening.

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4.多项选择题 In a customer’s network， VLAN Trunking Protocol （VTP） is running with a domain named main1. VLANs 1，2，3，4，5，10，20 are active on the network. Suddenly the whole network goes down. No traffic is being passed on VLANs 2，3，4，5，10，20， however traffic passes on VLAN 1 and indicates all switches are operational. Right before the network problem occurred， a switch named TEST1 was added to the network.
What three configuration issues on TEST1 could be causing the network outage？（）

A.TEST1 is configured as a VTP server with a different domain name.
B.TEST1 is not configured to participate in VTP.
C.TEST1 is configured as a VTP server with the domain name main1.
D.TEST1 has a lower VTP configuration revision than the current VTP revision.
E.TEST1 has a higher VTP configuration revision than the current VTP revision.
F.TEST1 is configured with only VLAN1.

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5.判断题 - DS1（ Distribute switch 1） is the primary device for Vlan 101， 102， 105
- DS2 （ Distribute switch 2） is the primary device for Vlan 103 and 104

参考答案：对

6.判断题 VLAN Trunk Protocol （VTP） reduces administration in a switched network. When you configure a new VLAN on one VTP server， the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. VTP is a Cisco-proprietary protocol that is available on most of the Cisco Catalyst series products. There is a Lab（about VTP） in the cisco CCNP BCMSN 642-812 exam.

Requirements：

These are your specifc tasks：
1. Configure the VTP information with the distribution layer switch as the VTP server
2. Configure the VTP information with the access layer switch as a VTP client
3. Configure VLANs on the distribution layer switch
4. Configure inter-VLAN routing on the distribution layer switch
5. Specific VLAN port assignments will be made as users are added to the access layer switches in the future.
6. All VLANs and VTP configurations are to completed in the global configuration To configure the switch Click on the host icon that is connected to the switch be way of a serial console cable.

参考答案：对

7.判断题 Spanning-Tree Protocol is a link management protocol that provides path redundancy while
preventing undesirable loops in the network. For an Ethernet network to function properly， only one active path can exist between two stations. Multiple active paths between stations cause loops in the network. If a loop exists in the network topology， the potential exists for duplication of messages. When loops occur， some switches see stations appear on both sides of the switch. This condition confuses the forwarding algorithm and allows duplicate frames to be forwarded. To provide path redundancy， Spanning-Tree Protocol defines a tree that spans all switches in an extended network. Spanning-Tree Protocol forces certain redundant data paths
into a standby （blocked） state. If one network segment in the Spanning-Tree Protocol becomes unreachable， or if Spanning-Tree Protocol costs change， the spanning-tree algorithm reconfigures the spanning-tree topology and reestablishes the link by activating the standby path. Spanning-Tree Protocol operation is transparent to end stations， which are unaware whether they are connected to a single LAN segment or a switched LAN of multiple segments.There is a lab about STP in Cisco CCNP 642-812 / 642- 892 exam.

Requirements:
You will configure FastEthernet ports 0/12 through 0/24 for users who belong to VLAN 20. Also, all VLAN and VTP configurations are to be completed in global configuration mode as VLAN database mode is being deprecated by Cisco. You are required to accomplish the following tasks:
1. Ensure the switch does not participate in VTP but forwards VTP advertisements received on trunk ports.
2. Ensure all non-trunking interfaces (Fa0/1 to Fa0/24) transition immediately to the forwarding state of Spanning-Tree.
3. Ensure all FastEthernet interfaces are in a permanent non-trunking mode.
4. Place FastEthernet interfaces 0/12 through 0/24 in VLAN 20

参考答案：对

8.判断题 Acme is a small shipping company that has an existing enterprise network comprised of 2
switches；DSW1 and ASW2. The topology diagram indicates their layer 2 mapping. VLAN 40 is a new VLAN that will be used to provide the shipping personnel access to the server. For security reasons， it is necessary to restrict access to VLAN 20 in the following manner：
- Users connecting to ASW1’s port must be authenticate before they are given access to the network. -Authentication is to be done via a Radius server：
- Radius server host： 172.120.39.46
-Radius key： rad123
- Authentication should be implemented as close to the host device possible.
- Devices on VLAN 20 are restricted to in the address range of 172.120.40.0/24.
- Packets from devices in the address range of 172.120.40.0/24 should be passed on VLAN 20.
- Packets from devices in any other address range should be dropped on VLAN 20.
- Filtering should be implemented as close to the server farm as possible.
The Radius server and application servers will be installed at a future date. You have been tasked with implementing the above access control as a pre-condition to installing the servers. You must use the available IOS switch features.

参考答案：对

9.判断题 topology exhibit：

You work as a network engineer at . is a large international company with offices on all continents. You work at the Chicago Office. Your boss at ，Miss ，has asked you to install a Catalyst 3500 to provide for another 24 users. Your instructions are as follows：
* install it in an IDF
* extremely import to have the proper configuration of the Catalyst before it is placed into the product information
* it should not participate in VTP
* it should forward VTP advertisements that are received on trunk ports
* all nontrunking interfaces， Fa0/1 to Fa0/24） should immediately to the forwarding state of the Spanning tree.
* configure all Fast Ethernet ports （the user ports） such as they are nontrunking.
* the fastEthernet interfaces 0/12 through 0/24 should be placed in VLAN 20

参考答案：对

10.判断题 Network topology exhibit：

You work as a network administrator at . You study the network topology exhibit carefully. is a small
company that has an existing enterprise network consisting of two switches named 1 and 2. The network topology schemata indicates their layer 2 mapping. VLAN 40 is a new VLAN that will be used to provide the shipping personnel access to the server. For security reasons， it is necessary to restrict access to VLAN 20 in the following manner：
Users connecting to 1’s port must be authenticate before they are given access to the network. Authentication is to be done via a Radius server：
Radius server host： 172.120.39.46
Radius key： key
Authentication should be implemented as close to the host device possible.
Devices on VLAN 20 are restricted to in the address range of 172.120.40.0/24.
Packets from devices in the address range of 172.120.40.0/24 should be passed on VLAN 20.
Packets from devices in any other address range should be dropped on VLAN 20. Filtering should be implemented as close to the server farm as possible.
The Radius server and application servers will be installed at a future date. You have been tasked with implementing the above access control as a pre-condition to installing the servers. You must use the available IOS switch features.

参考答案：对