[单项选择]Limit switches（）.
A. control the descent rate of a lifeboat
B. control the ascent rate of a lifeboat
C. cut off power to the winch when the lifeboat nears the final stowed position
D. cut off power to the winch when the lifeboat reaches the davit bumpers

[单项选择]Limit switches on gravity davits should be tested by（）.
A. the engineers，from a panel in the engine room
B. shutting off the current to the winch
C. pushing the switch lever arm while the winch is running
D. All of the above

[单项选择]Pedestal cranes have limit switches to restrict movement of which function（s）（）.
A. Hoist upper & lower limits
B. Luff travel limits
C. Rider block hoist upper & lower limits
D. All of the above

[单项选择]The limit switches on a ships survival-craft winch system（）.
A. stop the winch just before the craft reaches the final stowage position
B. limit the amount of cable on the drum
C. limit the ascent rate
D. stop the winch in case the craft weighs too much

[单项选择]Limit switches are used on which davits?（）
A. Sheath-screw davits
B. Gravity davits
C. Radial davits
D. Quadrantal davits

[单项选择]假如某小区的参数设置为：LIMIT1=4，LIMIT2=8，LIMIT3=15，LIMIT4=25；若该小区某时刻上行干扰信号到达基站CDU端的噪声电平为-104dBm，则该时刻的干扰带为（）
A. BAND1
B. BAND2
C. BAND3
D. BAND4
E. BAND5

[单项选择]How are VTP advertisements delivered to switches across the network?（）
A. anycast frames
B. multicast frames
C. broadcast frames
D. unicast frames

[单项选择]The Cisco MDS 9000 Series Multilayer SAN Switches can help lower the total cost of ownership of the most demanding storage environments. By combining a robust and flexible hardware architecture with multiple layers of network and storage-management intelligence, the Cisco MDS 9000 Series helps you build highly available, scalable storage networks with advanced security and unified management.What method does the Cisco MDS 9000 Series use to support trunking?（）
A. ISL
B. VLAN Trunk
C. VoQ
D. Enhanced ISL

[单项选择]To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus?（）
A. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 link
B. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 link
C. to two core switches from redundant distribution switches connected with a Layer 2 link
D. to two core switches from redundant distribution switches connected with a Layer 3 link
E. to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO

[单项选择]Three switches are connected to one anther via trunk ports.Assuming the default switch configuration,which switch is elected as the root bridge for the spanning-tree instance of vlan 1?（）
A. the switch with the lowest MAC address
B. the switch with the higest MAC address
C. the switch witch the higest IP address
D. the switch with the lowest IP address

[单项选择]Refer to the exibit. Three cisco 2950 switches are set to their default priority sttings.During the spanningtree process,which switch will be elected as the root bridge?（）
A. Switch3
B. Switch4
C. Switch2
D. Switch1

[多项选择]With regard to bridges and switches, which of the following statements are true?（）
A. Switches are primarily software based while bridges are hardware based.
B. Both bridges and switches forward Layer 2 broadcasts.
C. Bridges are frequently faster than switches.
D. Switches typically have a higher number of ports than bridges.
E. Bridges define broadcast domain while switches define collision domains.
F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.

[多项选择]Two switches are connected through a trunk link.which two commands show that there is a native VLAN mismatch on that link?（）
A. show interfaces interface
B. show vlan bri
C. show interfaces interface switchport
D. show interface interface trunk
E. show interfaces vlan

[多项选择] There are 2 switches in the Testking LAN, with no routers. Ports 1, 2 & 3 are assigned to VLAN 1 in switch 1 and 2 and ports 4, 5 & 6 are assigned to VLAN 2 in both switches. These two switches are connected together via a trunked link. Which of the conditions below would verify trunk and VLAN operation?（）
A. Host 1 on VLAN 1 can ping Host 2 on VLAN 1
B. Host 1 on VLAN 1 can ping Host 4 on VLAN 2
C. Host 1 on VLAN 1 can not ping Host 2 on VLAN 1
D. Host 4 on VLAN 2 can not ping Host 1 on VLAN 1
E. Host 4 on VLAN 2 can ping Host 2 on VLAN 2

[单项选择]Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13.An 802.1Q trunk is configured between the two switches.On CAT1，VLAN10 is chosen as native，but on CAT2 the native VLAN is not specified.What will happen in this scenario？（）
A. 802.1Q giants frames could saturate the link.
B. VLAN10 on CAT1 and VLAN1 on CAT2 will send untagged frames.
C. A native VLAN mismatch error message will appear.
D. VLAN10 on CAT1 and VLAN1 on CAT2 will send tagged frames.

[单项选择]Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An 802. 1Q trunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 the native VLAN is not specified.What will happen in this scenario？（）
A. 802.1Q giants frames could saturate the link
B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames
C. A native VLAN mismatch error message will appear
D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.