有效积温法则中,T0(或C)的含义是 ()
A.物理零度
B.生物学零度
C.最低温度
D.平均温度
第1题
A. Layer 2 TTL
B. Layer 3 TTL
C. Layer 3 source address
D. Layer 3 transport protocol
E. Layer 3 destination address
第2题
A. Layer 2 TTL
B. Layer 3 TTL
C. Layer 3 source address
D. Layer 3 destination address
第3题
A.A. transmission layer
B.B.session layer
C.C.presentation layer
D.D.program layer
第5题
A. When the discovery packet enters the router from the DHCP client.
B. Only when the offer packet enters the router from the DHCP server.
C. When the acknowledge packet enters the router from the DHCP server.
D. Only when the discovery packet leaves the router going to the DHCP server.
第6题
TCP functions at the Open Systems Interconnection(OSI)transport layer, or Layer 4. Its chief responsibility is to ensure reliable end-to-end connectivity. IP, located one layer (1), at the OSI network layer, or Layer 3,communicates the addresses of each packet’s sender and receiver to the routers along the way .Routers and Layer 3 switches can read IP and other Layer 3 protocols. This information, combined with routing tables and other network intelligence, it takes to get across the room or around the world(2)TCP/IP.
The routing process begins with an IP address that is(3)to the sending end station. End stations may be assigned permanent IP addresses or they may borrow them as needed from a Dynamic Host Configuration Protocol(DHCP)server or other service. If the sending end station determines that the destination address is not local, the packet goes to a first-hop router, typically one that is close and has been reassigned to the(4). The router inspects the packet’s IP address and performs a route table lookup to see if the destination end station resides on the local(physically connected)network, typically called an IP subnet. An IP subnet usually is assigned to each of the router’s network interfaces. If the destination IP address is local, the router searches an internal store of IP addresses and local-device media access control(MAC)addresses. This store is known as the Address Resolution Protocol(ARP) cache. ARP is the universal tool for(5)IP addresses to MAC addresses. If the destination’s MAC address appears, the router installs that MAC address in the packet header(removing its own MAC address because that’s no longer needed)and sends the packet to the destination end station.
(1)A. up
B. down
C. sideward
D. back-fence
(2)A. via
B. through
C. by
D. through out
(3)A. special
B. especial
C. unique
D. particular
(4)A. accepter
B. sender
C. router
D. server
(5)A. searching
B. looking
C. locating
D. matching
第7题
A.to uniquely identify devices at Layer 2
B.to allow communication with devices on a different network
C.to differentiate a Layer 2 frame from a Layer 3 packet
D.to establish a priority system to determine which device gets to transmit first
E.to allow communication between different devices on the same network
F.to allow detection of a remote device when its physical address is unknown
第8题
TCP functions at the Open Systems Interconnection(OSI)transport layer, or Layer 4. Its chief responsibility is to ensure reliable end-to-end connectivity. IP, located one layer (1), at the OSI network layer, or Layer 3,communicates the addresses of each packet’s sender and receiver to the routers along the way .Routers and Layer 3 switches can read IP and other Layer 3 protocols. This information, combined with routing tables and other network intelligence, it takes to get across the room or around the world(2)TCP/IP.
The routing process begins with an IP address that is(3)to the sending end station. End stations may be assigned permanent IP addresses or they may borrow them as needed from a Dynamic Host Configuration Protocol(DHCP)server or other service. If the sending end station determines that the destination address is not local, the packet goes to a first-hop router, typically one that is close and has been reassigned to the(4). The router inspects the packet’s IP address and performs a route table lookup to see if the destination end station resides on the local(physically connected)network, typically called an IP subnet. An IP subnet usually is assigned to each of the router’s network interfaces. If the destination IP address is local, the router searches an internal store of IP addresses and local-device media access control(MAC)addresses. This store is known as the Address Resolution Protocol(ARP) cache. ARP is the universal tool for(5)IP addresses to MAC addresses. If the destination’s MAC address appears, the router installs that MAC address in the packet header(removing its own MAC address because that’s no longer needed)and sends the packet to the destination end station.
(1)A. up
B. down
C. sideward
D. back-fence
(2)A. via
B. through
C. by
D. through out
(3)A. special
B. especial
C. unique
D. particular
(4)A. accepter
B. sender
C. router
D. server
(5)A. searching
B. looking
C. locating
D. matching
第9题
A.is generating B.generate C.is generated D.generates A.forwarding table B.network interfaces C.routing policies D.destination address A.the destination address and network interfaces B.forwarding table and network interfaces C.the destination address and forward table D.routing policies and routing table
第10题
A. to uniquely identify devices at Layer 2
B. to allow communication with devices on a different network
C. to differentiate a Layer 2 frame from a Layer 3 packet
D. to establish a priority system to determine which device gets to transmit first
E. to allow communication between different devices on the same network
F. to allow detection of a remote device when its physical address is unknown
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