更多"What is implied by saying 'a layer "的相关试题:
[单项选择]In a Bridged 1483 network, what Layer 2 encapsulations are passed between the DSL bridge and the ERX?（）
A. single ATM header
B. single Ethernet header
C. ATM header followed by a PPP header
D. ATM header followed by an Ethernet header
[多项选择]What are some common layer 2 encapsulations for a WAN link?（）
A. Ethernet
B. PPP
C. Token Ring
D. HDLC
E. Frame Relay
F. POTS
[多项选择]What are two advantages of Layer 2 Ethernet switches over hubs?（）
A. decreasing the number of collision domains
B. filtering frames based on MAC addresses
C. allowing simultaneous frame transmissions
D. increasing the size of broadcast domains
E. increasing the maximum length of UTP cabling between devices
[单项选择]What will happen if the dust aerosol layer develops
A. The earth will get extremely hot.
B. The balance between the amount of heat absorbed from the Sun and the amount lost could hardly be maintained.
C. The light of the Sun could no longer reach the surface of the Earth.
D. Infrared radiation could no longer be transmitted from the Earth to outer space.
[单项选择]What does a Layer 2 switch use to decide where to forward a received frame?（）
A. source MAC address
B. source IP address
C. source switch port
D. destination IP address
E. destination port address
F. destination MAC address
[单项选择]What dose a Layer 2 switch use to decide where to forward a received frame?（）
A. source MAC address
B. source IP address
C. source switch port
D. destination IP address
E. destination port address
F. destination MAC address
[单项选择]What does a Layer 2 switch do if it receives a frame with a destination MAC address that is not found in its MAC address table?（）
A. The frame is dropped.
B. The frame is addressed with a broadcast MAC address and sent out all ports.
C. The frame is sent out all ports except the receiving port.
D. An ARP request is sent out all ports except the receiving port.
E. A destination unreachable message is sent back to the source address.
F. None of the above.
[单项选择]What layer of the TMN （telecommunications management network） model does CTM fit into？（）
A. Network management layer
B. Element management layer
C. Business management layer
D. Network element layer
[单项选择]In comparison with traditional Layer 2 and Layer 3 system, Cisco Catalyst 6500 Virtual Switching System (VSS) 1440 simplifies a network by the means of:（）
A. providing loop-free technology.
B. providing HSRP/VRRP.
C. managing additional routing peers.
D. managing two nodes and configuration.
[单项选择]Distribution layer: This layer includes LAN-based routers and layer 3 switches . When is a first-hop redundancy protocol needed in the distribution layer?（）
A. OSPF is not supported by the design
B. HSRP is not supported by the design
C. preempt tuning of the default gateway is needed
D. the design implements Layer 3 between the access switch and the distribution switch
[单项选择]Compared to the traditional Layer 2 and Layer 3 system, how does the Cisco Catalyst 6500 VSS1440 simplify the network? （）
A. provides loop-free technology
B. manages additional routing peers
C. provides HSRP/VRRP
D. manages two nodes and configuration
[单项选择]In the 7-layer OSI model, which layer switching will take place?（）
A. Layer one
B. Layer two
C. Layer three
D. Layer four
[多项选择]As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen?（）
A. The data is moving from 10BASE-TX to 100BASE-TX.
B. The WAN encapsulation type has changed.
C. The data format has changed from analog to digital.
D. The source and destination hosts are in the same subnet.
E. The source and destination MAC addresses have changed.
[单项选择]If roundworms are removed from the soil and placed in a liquid, they thrash {{U}}helplessly{{/U}} around.
A. carelessly
B. tirelessly
C. powerlessly
D. heartlessly
[单项选择]Top soil ______.
A. is good for agriculture
B. is useless and unproductive
C. is found only in desert regions
D. is dry and sandy
[单项选择]How did glacial meltdown affect the soil in North America
A. ( It redistributed the soil types
B. ( It added salt to the soil
C. ( It made the soil more neutral in content
D. ( It added minerals to the soil
