Networks 1

1.

1 point

Which of these is a field in a TCP header but not in a UDP header?

Sequence number

Destination port

Checksum

TTL

2.

1 point

Which of these is not a characteristic of the UDP protocol

ease of use

connection-oriented

best-effort

application port numbers

3.

1 point

The IP header's IHL field shows ____.

the IP payload's length, in 32-bit words

the IP PDU's length, in bytes

the header's length, in 32-bit words

the header's length, in 8-bit octets

4.

1 point

You have the IP block 10.44.0.0/16, and you need to create subnets containing 50 hosts apiece. You need ____ host bits

6

8

16

4

5.

1 point

A host that has sent TCP data knows that the data has been received when it receives a(n) ____ from the destination

ICMP data received

PUSH

SYN/ACK

ICMP echo request

acknowledgement

three-way handshake

6.

1 point

The Total Length field in the IP headers is ____ in size, limiting a packet to no more than ____ in length

8 bits, 256 words

16 bits, 65,536 bytes

4 bits, 16 words

32 bits, about 4 billion bytes

7.

1 point

____ can be used to make an internal server accessible to external clients

Overloaded NAT

Port Forwarding

Stateful NAT

Port Address Translation

Dynamic NAT

Static NAT

8.

1 point

Which of the following best characterizes ICMP?

it is used for connection-oriented communications

it is used for reliable communications

it is used to communicate error conditions

it is used for client/server communications

9.

1 point

You have the IP block 10.44.0.0/16. The corresponding netmask for this entire block is

255.255.128.0

255.255.255.0

255.44.0.0

255.224.0.0

255.255.0.0

255.0.0.0

10.

1 point

Which of these is not one of the private, non-routable IP address blocks?

192.168.0.0/16

10.0.0.0/8

169.254.0.0/16

172.16.0.0/12

11.

1 point

Which of these subnet masks is illegal?

255.0.0.0

255.255.160.0

All are legal

All are illegal

255.255.255.0

255.255.224.0

12.

1 point

A Class C address has ____ bits for the network address, and ____ bits for the host address

16, 16

32, 0

8, 8

24, 8

24, 24

8, 24

13.

1 point

You have the IP block 10.44.0.0/16, and you need to create 100 subnets. The proper subnet mask will be

255.0.252.0

255.44.150.0

255.255.254.0

255.255.150.0

255.255.255.0

255.255.224.0

14.

1 point

The ____ protocol holds an email message on the server until the user selects it.

IMAP

NTP

SMTP

POP

15.

1 point

Here is a hexadecimal dump of the IP header of a packet: 4500 0031 7e7a 0000 8011 ec33 9e8a 3b61 ffff ffff. If the Total Length field occupies the bytes at offsets 2 and 3, what is the decimal length of this packet?

49

48

34

31

17

62

16.

1 point

The ping command usually uses ____.

SMTP

TCP

IGMP

FTP

UDP

ICMP

17.

1 point

Internet standards are found in ____.

Internet Protocols

Requests For Comments

Releases to Market

OSI layers

IANA

IEEE 802

18.

1 point

Which of these protocols saw early usage in UNIX systems

IPX/SPX

NetBIOS/NetBEUI

X.25

TCP/IP

AppleTalk

Cisco IOS

19.

1 point

A DHCP request is used to ____.

obtain a dynamic IP address

set up a DHCP connection

find a destination host's IP address

obtain a static IP address

20.

1 point

RFCs are maintained by ____.

EIA/TIA

IANA

ICANN

IEEE

ISO

IETF