Cisco试题库:ccna最新真题
17: a new network is being designed for your company, acme, inc. if you use a class c ip network, which subnet mask will provide one usable subnet per department while allowing enough usable host addresses for each department specified in the table?
department
number of users
corporate
7
customer support
15
financial
13
hr
7
engineering
16
a. 255.255.255.0
b. 255.255.255.192
c. 255.255.255.224
d. 255.255.255.240
e. 255.255.255.248
18: which of these protocols provides data transport, relying on the error correction capabilities of the application itself?
a. udp
b. tcp
c. snmp
d. icmp
19: which of the following are used by tcp to ensure reliable delivery of data? (choose two.)
a. mac address resolution
b. sequence numbers
c. acknowledgments(GbbFi, tk k&dF={(GbbFi, tk k&dF={t$
d. ping
e. routing updates
20: you discover that you are able to adjust the window size of the tcp segment. you increase the window size to test the results. what will you observe happening on your network?
a. increased throughput
b. decreased throughput
c. increased latency
d. decreased reliability
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.
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
