2020年网络工程师上午真题及答案解析（八）

软工小能手

2024-04-18 16:39

短信预约 网络工程师 报名、考试、查分时间动态提醒

　　2020下半年网络工程师考试已经结束，今天编程学习网小编为大家整理了2020年网络工程师上午真题及答案解析(八)，供大家考后估分。

　　The Address Resolution Protocol(ARP)was developed to enable communication on an Internetwork and perform a required function in IP routing.ARP lies between layers(71)of the OSI model,and allows computers to introduce each other across a network prior to communication.APR finds the(72)address of a host from its known(73)address.Before a device sends a datagram to another device,it looks in its ARP cache to see if there is a MAC address and corresponding IP address for the destination device.If there is no entry,the souree device sends a(74)message to every device on the network.Each device compares the IP address to its own.Only the device with the matching IP address replies with a packet containing the MAC address for the device(except in the case of “proxy ARP”).The source device adds the(75)device MAC address to its ARP table for future reference.

　　(71)A.1 and 2

　　B.2 and 3

　　C.3 and 4

　　D.4 and 5

　　(72)A.IP

　　B.logical

　　C.hardware

　　D.network

　　(73)A.IP

　　B.physical

　　C.MAC

　　D.virtual