就業(yè)課程
認(rèn)證課程
企業(yè)課程1、Which two tasks does the Dynamic Host Configuration Protocol perform? (Choose two.)
DHCP服務(wù)器 在網(wǎng)絡(luò)中作用。
A. Set the IP gateway to be used by the network. 通過網(wǎng)關(guān)設(shè)置網(wǎng)關(guān)， 錯(cuò)。
B. Perform host discovery used DHCPDISCOVER message.
C. Configure IP address parameters from DHCP server to a host.
通過DHCP 服務(wù)器給主機(jī)分配IP地址
D. Provide an easy management of layer 3 devices.
E. Monitor IP performance using the DHCP server.
F. Assign and renew IP address from the default pool. 從默認(rèn)地址池中分配和重新獲取IP地址
Answer: CF
2、When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choose two.) 當(dāng)一個(gè)DHCP配置好的時(shí)候，哪兩個(gè)地址將永遠(yuǎn)不會(huì)分配給主機(jī)？
A. network or subnetwork IP address
B. broadcast address on the network
C. IP address leased to the LAN
D. IP address used by the interfaces
E. manually assigned address to the clients
F. designated IP address to the DHCP server
Answer: AB
網(wǎng)段地址和廣播地址。其他地址都可能會(huì)被分配。 所以我們在做DHCP的時(shí)侯，會(huì)保留一部分地址不放在地址池中
3、 Which statement describes the process of dynamically assigning IP addresses by the DHCP server? 那一個(gè)選項(xiàng)描述了DHCP動(dòng)態(tài)分配地址的過程？
A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement. 在DHCP租約期限一半時(shí)，DHCP客戶端會(huì)提交租約續(xù)訂請求到DHCP服務(wù)器。如果DHCP服 務(wù)器在聯(lián)機(jī)狀態(tài)，那么通 常DHCP服務(wù)器會(huì)接受續(xù)訂，然后租約周期重新開始 。如果DHCP服務(wù)器不可用那
B. Addresses are permanently assigned so that the hosts uses the same address at all times.
C. Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made. DHCP客戶端會(huì)在剩余一半的租約周期過去后嘗試再次續(xù)訂DHCP租約。如果在 租約時(shí)間的87.5%過去后DHCP服務(wù)器仍然不可用， DHCP客戶端會(huì)嘗試尋找一個(gè)新的DHCP服務(wù)器，并可能獲 取一個(gè)不同的IP地址
D. Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease. 地址被租用給主機(jī)， 需要定期的和dhcp服務(wù)器聯(lián)系以獲得新的租約。
Answer: D 根據(jù)以上分析可得出答案D 為正確的
