CCNA真题(1)TCP/IP：地址和协议(2)

会计考友

21: your organization is using the 192.168.1.0/24 address space. you need 28 subnets. what subnet mask would you use to create these subnets?
a. 255.255.255.0
. e* ?. q4 W* k" |b. 255.255.255.128
c. 255.255.255.192
* }) O) |2 J2 ]! `; m: \0 gd. 255.255.255.224
5 q( s' z: [, E! v2 pe. 255.255.255.240
. K) S8 w- T. L3 W6 J  uf. 255.255.255.248

22: which of the following protocols maps ip addresses to mac addresses for connectivity to occur between two hosts?
a. arp
b. rarp
" @% f7 i- J) Q; @* P$ v, O1 ]c. slarp
d. dhcp

23: your junior network administrator cannot seem to ping a host in another network and asks you why it isn't working. which of the following is not an answer that you would give him?
0 H6 U4 C9 v& N* ya. the host's default gateway is down.
4 z/ j1 D, L8 O$ K7 t: fb. the destination host is not powered on.
4 y3 s# t5 u- D5 jc. the ip address of the router interface is incorrect.
9 q, I: Q0 l, o0 O  D/ Fd. the ip address of the switch to which the destination host connects is incorrect.
e. the host is in a different subnet.

24: which of the following classes of ip addresses is utilized for multicasting?
/ O- @2 G  Z  z3 A( `$ Y% s2 t/ Ua. class a
b. class b
c. class c
d. class d

25: you give your it department a spreadsheet of ip addresses and their subnets. you receive a call from one of the junior techs asking what the /26 means next to the ip addresses. you tell her:
a. it represents the number of hosts possible on that subnetwork.
b. it represents the number of subnetworks that are being used.
) C6 d. E- H2 g: Q. Ac. it represents the class of ip address being used.
d. it represents the number of bits in the subnet mask that are 1.