CMS专题
单选题Why would a network administrator configure port security on a switch（）。A to prevent unauthorized Telnet access to a switch portB to limit the number of Layer 2 broadcasts on a particular switch portC to prevent unauthorized hosts from accessing the LA
题目
to prevent unauthorized Telnet access to a switch port
to limit the number of Layer 2 broadcasts on a particular switch port
to prevent unauthorized hosts from accessing the LAN
to protect the IP and MAC address of the switch and associated ports
to block unauthorized access to the switch management interfaces over common TCP ports
相似问题和答案
第1题：
A.to prevent unauthorized Telnet access to a switch port
B.to limit the number of Layer 2 broadcasts on a particular switch port
C.to prevent unauthorized hosts from accessing the LAN
D.to protect the IP and MAC address of the switch and associated ports
E.to block unauthorized access to the switch management interfaces over common TCP ports
第2题：
Why would a network administrator configure port security on a switch?（）
- A、to prevent unauthorized Telnet access to a switch port
- B、to limit the number of Layer 2 broadcasts on a particular switch port
- C、to prevent unauthorized hosts from accessing the LAN
- D、to protect the IP and MAC address of the switch and associated ports
- E、to block unauthorized access to the switch management interfaces over common TCP ports
正确答案:C
第3题：
The network administrator has configured port security on a Ezonexam switch. Why would a network administrator configure port security on this Ezonexam device?
A．To prevent unauthorized hosts from getting access to the LAN
B．To limit the number of Layer 2 broadcasts on a particular switch port
C．To prevent unauthorized Telnet or SSH access to a switch port
D．To prevent the IP and MAC address of the switch and associated ports
E．None of the above
解析：Explanation:
You can use the port security feature to restrict input to an interface by limiting and identifying MAC addresses of the stations allowed to access the port. When you assign secure MAC addresses to a secure port, the port does not forward packets with source addresses outside the group of defined addresses. If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the workstation attached to that port is assured the full bandwidth of the port.
If a port is configured as a secure port and the maximum number of secure MAC addresses is reached, when the MAC address of a station attempting to access the port is different from any of the identified secure MAC addresses, a security violation occurs. Also, if a station with a secure MAC address configured or learned on one secure port attempts to access another secure port, a violation is flagged.
第4题：
A network administrator wants to ensure that only the server can connect to port Fa0/1 on a Catalyst switch. The server is plugged into the switch Fa0/1 port and the network administrator is about to bring the server online. What can the administrator do to ensure that only the MAC address of the server is allowed by switch port Fa0/1?（）
- A、Configure port Fa0/1 to accept connections only from the static IP address of the server.
- B、Employ a proprietary connector type on Fa0/1 that is incompatible with other host connectors.
- C、Configure the MAC address of the server as a static entry associated with port Fa0/1.
- D、Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address.
- E、Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server.
- F、Configure an access list on the switch to deny server traffic from entering any port other than Fa0/1.
正确答案:C,E
第5题：
The network security policy requires that only one host be permitted to attach dynamically to each switch interface. If that policy is violated, the interface should shut down. Which two commands must the network administrator configure on the 2950 Catalyst switch to meet this policy (Choose two.)（）。
- A、Switch1(config-if)# switchport port-security maximum 1
- B、Switch1(config)# mac-address-table secure
- C、Switch1(config)# access-list 10 permit ip host
- D、Switch1(config-if)# switchport port-security violation shutdown
- E、Switch1(config-if)# ip access-group 10
正确答案:A,D
第6题：
Why would a network administrator configure port security on a switch?（）
- A、To prevent unauthorized Telnet access to a switch port.
- B、To limit the number of Layer 2 broadcasts on a particular switch port.
- C、To prevent unauthorized hosts from accessing the LAN.
- D、To protect the IP and MAC address of the switch and associated ports.
- E、To block unauthorized access to the switch management interfaces over common TCP ports.
正确答案:C
第7题：
A network administrator needs to configure port security on a switch.which two statements are true？（）
- A、The network administrator can apply port security to dynamic access ports
- B、The network administrator can configure static secure or sticky secure mac addresses in the voice vlan.
- C、The sticky learning feature allows the addition of dynamically learned addresses to the runningconfiguration.
- D、The network administrator can apply port security to EtherChannels.
- E、When dynamic mac address learning is enabled on an interface，the switch can learn new addresses，up to the maximum defined.
正确答案:C,E
第8题：
The Ezonexam network administrator wants to ensure that only a single web server can connect to pot Fa0/1 on a catalyst switch. The server is plugged into the switch's Fast Eth. 0/1 port and the network administrator is about to bring the server online. What can the administrator do to ensure that only the MAC address of this server is allowed by switch port Fa0/1? (Choose two)
A．Configure port Fa0/1 to accept connections only from the static IP address of the server
B．Configure the MAC address of the server as a static entry associated with port Fa0/1
C．Employ a proprietary connector type on Fa0/1 that is incomputable with other host connectors
D．Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server
E．Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address
解析：Explanation:
You can use port security to block input to an Ethernet, Fast Ethernet, or Gigabit Ethernet port when the MAC address of the station attempting to access the port is different from any of the MAC addresses specified for that port.
When a secure port receives a packet, the source MAC address of the packet is compared to the list of secure source addresses that were manually configured or autoconfigured (learned) on the port. If a MAC address of a device attached to the port differs from the list of secure addresses, the port either shuts down permanently (default mode), shuts down for the time you have specified, or drops incoming packets from the insecure host.
The port's behavior. depends on how you configure it to respond to a security violation. When a security violation occurs, the Link LED for that port turns orange, and a link-down trap is sent to the Simple Network Management Protocol (SNMP) manager. An SNMP trap is not sent if you configure the port for restrictive violation mode. A trap is sent only if you configure the port to shut down during a security violation.
第9题：
A network administrator needs to configure port security on a switch.which two statements are true?（）
- A、The network administrator can apply port security to dynamic access ports
- B、The network administrator can configure static secure or sticky secure mac addresses in the voice vlan.
- C、The sticky learning feature allows the addition of dynamically learned addresses to the running configuration.
- D、The network administrator can apply port security to EtherChannels.
- E、When dynamic mac address learning is enabled on an interface,the switch can learn new addresses,up to the maximum defined.
正确答案:C,E
第10题：
A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices.What would be the most efficient way to configure MAC-level security on all these ports？ （）
- A、Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command.
- B、Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command.
- C、Use the switchport port-security MAC address sticky command on all the switch ports that have end devices connected to them.
- D、Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security.
正确答案:C