CCNA系列认证
单选题A workgroup switch is configured with all ports assigned to VLAN 2. In addition,all ports are configured as full-duplex FastEthernet. What is the effect of adding switch ports to a new VLAN on this switch?（）A The additions will create more collision do
题目
The additions will create more collision domains.
IP address utilization will be more efficient.
More bandwidth will be required than was needed previously.
An additional broadcast domain will be created.
The possibility that switching loops will occur will increase dramatically.
相似问题和答案
第1题：
A switch is configured with all ports assigned to vlan 2 with full duplex FastEthernet to segment existing departmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?（）
- A、More collision domains will be created.
- B、IP address utilization will be more efficient.
- C、More bandwidth will be required than was needed previously.
- D、An additional broadcast domain will be created.
正确答案:D
第2题：
Which statement describes a spanning-tree network that has converged?（）
- A、All switch and bridge ports are in the forwarding state.
- B、All switch and bridge ports are assigned as either root or designated ports.
- C、All switch and bridge ports are in either the forwarding or blocking state.
- D、All switch and bridge ports are either blocking or looping.
正确答案:C
第3题：
A Ezonexam switch is configured with all ports assigned to VLAN 2. In addition, all ports are configured as full-duplex FastEthernet. What is the effect of adding switch ports to a new VLAN on this switch?
A．The additions will create more collisions domains.
B．IP address utilization will be more efficient.
C．More bandwidth will be required than was needed previously.
D．An additional broadcast domain will be created.
E．The possibility that switching loops will occur will increase dramatically.
解析：Explanation:
A VLAN is a group of hosts with a common set of requirements that communicate as if they were attached to the same wire, regardless of their physical location. A VLAN has the same attributes as a physical LAN, but it allows for end stations to be grouped together even if they are not located on the same LAN segment.
Networks that use the campus-wide or end-to-end VLANs logically segment a switched network based on the functions of an organization, project teams, or applications rather than on a physical or geographical basis. For example, all workstations and servers used by a particular workgroup can be connected to the same VLAN, regardless of their physical network connections or interaction with other workgroups.
Network reconfiguration can be done through software instead of physically relocating devices. Cisco recommends the use of local or geographic VLANs that segment the network based on IP subnets. Each wiring closet switch is on its own VLAN or subnet and traffic between each switch is routed by the router. The reasons for the Distribution Layer 3 switch and examples of a larger network using both the campus-wide and local VLAN models will be discussed later.
A VLAN can be thought of as a broadcast domain that exists within a defined set of switches. Ports on a switch can be grouped into VLANs in order to limit unicast, multicast, and broadcast traffic flooding. Flooded traffic originating from a particular VLAN is only flooded out ports belonging to that VLAN, including trunk ports, so a switch that connects to another switch will normally introduce an additional broadcast domain.
第4题：
What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?（）
- A、All switch and bridge ports are in the forwarding state.
- B、All switch and bridge ports are in the stand-by state.
- C、All switch and bridge ports are assigned as either root or designated ports.
- D、All switch and bridge ports are in either the forwarding or blocking state.
- E、All switch and bridge are either blocking or looping.
正确答案:D
第5题：
Refer to the exhibit. The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem?（）
- A、Ensure that the Ethernet encapsulations match on the interconnected router and switch ports.
- B、Ensure that cables A and B are straight-through cables.
- C、Ensure cable A is plugged into a trunk port.
- D、Ensure the switch has power.
- E、Reboot all of the devices.
- F、Reseat all cables.
正确答案:B,D,F
第6题：
f a Cisco switch is configured with VTPv1 in transparent mode， what is done with received VTP advertisements？（）
- A、They are discarded
- B、The contents are altered to reflect the switch’s own VTP database and then they are forward out all trunking ports
- C、The changes within the advertisements are made to the switch’s VTP database.
- D、The contents are ignored and they are forwarded out all trunking ports.
正确答案:A
第7题：
The DAI feature has been implemented in the Company switched LAN. Which three statements are true about the dynamic ARP inspection （DAI） feature？ （）
- A、 DAI can be performed on ingress ports only.
- B、 DAI can be performed on both ingress and egress ports.
- C、 DAI is supported on access ports， trunk ports， EtherChannel ports， and private VLAN ports.
- D、 DAI should be enabled on the root switch for particular VLANs only in order to secure the ARP caches of hosts in the domain.
- E、 DAI should be configured on all access switch ports as untrusted and on all switch ports connected to other switches as trusted.
- F、 DAI is supported on access and trunk ports only.
正确答案:A,C,E
第8题：
A.Switch A - Fa0/0
B.Switch A - Fa0/1
C.Switch B - Fa0/0
D.Switch B - Fa0/1
E.Switch C - Fa0/0
F.Switch C - Fa0/1
第9题：
Refer to the exhibit. The output that is shown is generated at a switch. Which three of these statements are true? （）
- A、All ports will be in a state of discarding, learning, or forwarding.
- B、Thirty VLANs have been configured on this switch.
- C、The bridge priority is lower than the default value for spanning tree.
- D、All interfaces that are shown are on shared media.
- E、All designated ports are in a forwarding state.
- F、The switch must be the root bridge for all VLANs on this switch.
正确答案:A,C,E
第10题：
The following was configured on a switch： Switch（config） # spanning-tree portfast bpdufilter default What is the effect of this configuration command？（）
- A、If BPDUs are received by a port configured for PortFast， they are ignored and none are sent.
- B、The command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.
- C、If BPDUs are received by a port configured for Portfast， the port will transition to forwarding state.
- D、If BPDUs are received by a port configured for PortFast， then PortFast is disabled and the BPDUs are processed normally.
- E、None of the other alternatives apply.
正确答案:D