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单选题
When a packet is sent from Host 1 to Server 1, in how many different frames will the packet be  encapsulated as it is sent across the internetwork?()
A

0

B

1

C

2

D

3

E

4


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考题 单选题How does the ERX Edge Router interact with subscriber IP addresses assigned by an external DHCP server?()A It monitors messages from the external server and updates the routing table as needed.B It maintains the leases for the DHCP server and reassigns addresses to new subscribers.C It sends keep alives to the subscriber and makes the address available when the subscriber stops responding.D It sends keep alives to the subscriber and removes the host route when the subscriber stops responding.

考题 单选题An internet is a combination of networks connected by (1). When a datagram goes from a source to a (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway? 空白(4)处应选择()A destinationB resourceC packetD source

考题 单选题When does the E-series router start monitoring DHCP traffic using the DHCP External function?()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.