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

　　b. 255.255.255.128

　　c. 255.255.255.192

　　d. 255.255.255.224

　　e. 255.255.255.240

　　f. 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

　　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?

　　a. the host’s default gateway is down.

　　b. the destination host is not powered on.

　　c. the ip address of the router interface is incorrect.

　　d. 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?

　　a. 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. V[%|0ct
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　　b. it represents the number of subnetworks that are being used.

　　c. it represents the class of ip address being used.

　　d. it represents the number of bits in the subnet mask that are 1.

　26: you are given an ip network of 192.168.5.0 and told that you need to separate this network into subnetworks that can support a maximum of 16 hosts per subnet. this will help alleviate congestion on the network. what subnet mask can you use to create the subnets necessary to meet the given criteria?

　　a. 255.0.0.0

　　b. 255.255.0.0

　　c. 255.255.255.0

　　d. 255.255.255.224

　　e. 255.255.255.240

　　27: which of the following would a class a network be assigned to?

　　a. government agency

　　b. small-to-medium sized corporation

　　c. soho

　　d. an individual

　　28: a client has the ip address 192.168.5.98/27. which of the following addresses are on the same subnet as this host? (choose two.)

　　a. 192.168.5.95

　　b. 192.168.5.100

　　c. 192.168.5.128

　　d. 192.168.5.110

　　29: which of the following ip addresses is not a public ip address that can be routed over the internet?

　　a. 2.3.4.5

　　b. 11.12.13.14

　　c. 165.23.224.2

　　d. 172.31.45.34

　　e. 203.33.45.22

　　30: you are given a class b network. what is the default subnet mask assigned to the class b network?

　　a. 255.255.255.255

　　b. 255.255.0.0

　　c. 255.224.0.0

　　d. 0.0.0.0