Quiz 1-2

Question 1

A(n) _______ is the logical, not physical, component of a TCP connection.

ISN
Socket
Port
SYN

Answer 1

port

Question 2

Each Class C IP address supports up to ___ host computers.

254
512
65, 000
16 million

Answer 2

254

Question 3

In TCP, the __________________________ is a 32 bit number that tracks the packets received by the node and allows reassembling of large packets that have been broken into smaller packets.

Answer 3

initial sequence number (ISN)

Question 4

In the TCP/IP stack, the _______________ layer represents the physical network pathway and the network interface card.

Answer 4

network

Question 5

In the TCP/IP stack the _________________ layer is responsible for getting data packets to and from the Application layer by using port numbers.

Answer 5

transport

Question 6

In the TCP/IP stack, the \_\_\_\_ layer uses IP addresses to route packets.
Answer    Internet 
   Network 
   Transport 
   Application

Answer 6

Internet

Question 7

In the TCP/IP stack, the ____ layer is where applications and protocols, such as HTTP and Telnet, operate.

Answer   
 Internet 
   Network 
  Transport 
  Application

Answer 7

Application

Question 8

In the TCP/IP stack, the \_\_\_\_ layer is concerned with physically moving electrons across a medium.
Answer    Internet 
   Network 
   Transport 
   Application

Answer 8

Network

Question 9

In the TCP/IP stack, the \_\_\_\_ layer is concerned with controlling the flow of data, sequencing packets for reassembly, and encapsulating the segment with a TCP or UDP header.
Answer   
 Internet 
   Network 
   Transport 
   Application

Answer 9

Transport

Question 10

In the TCP/IP stack, the Transport layer includes network services and client software.

Answer 10

False

Question 11

No matter what medium connects computers on a network—copper wires, fiber-optic cables, or a wireless setup—the same protocol must be running on all computers if communication is going to function correctly.

Answer 11

True

Question 12

Often technical personnel who aren’t familiar with security techniques think that restricting access to ports on a router or firewall can protect a network from attack. Is this a good solution?

Answer 12

This is easier said than done. After all, if a firewall prevents any traffic from entering or exiting a network on port 80, you have indeed closed a vulnerable port to access from hackers. However, you have also closed the door to Internet access for your users, which probably isn’t acceptable to your company. The tricky (and almost impossible) part for security personnel is attempting to keep out the bad guys while allowing the good guys to work and use the Internet.

Question 13

The IP in TCP/IP stands for ____________________.

Answer 13

Internet Protocol

Question 14

The HTTP service uses port \_\_\_\_.
Answer    25 
   53 
   69 
   80

Answer 14

80

Question 15

The DNS service uses port \_\_\_\_.
Answer    25 
   53 
   69 
   80

Answer 15

53

Question 16

TCP stands for \_\_\_\_.
Answer  
  Transfer Control Protocol 
   Transmission Control Protocol 
   Transfer Congestion Protocol 
   THE Control Protocol

Answer 16

Transmission Control Protocol

Question 17

TCP is a(n) ____________________ protocol, which means the sender doesn’t send any data to the destination node until the destination node acknowledges that it’s listening to the sender.

Answer 17

connection-oriented

Question 18

The Microsoft RPC service uses port \_\_\_\_.
Answer    110 
   119 
   135 
   139

Answer 18

135

Question 19

The NetBIOS service uses port \_\_\_\_.
Answer    
110 
   119 
   135 
   139

Answer 19

139

Question 20

The Network News Transport Protocol service uses port \_\_\_\_.
Answer    110 
   119 
   135 
   139

Answer 20

119

Question 21

The POP3 service uses port \_\_\_\_.
Answer   
 110 
   119 
   135 
   139

Answer 21

110

Question 22

The SMTP service uses port \_\_\_\_.
Answer    25 
   53 
   69 
   80

Answer 22

25

Question 23

The TFTP service uses port \_\_\_\_.
Answer    25 
   53 
   69 
   80

Answer 23

69

Question 24

The \_\_\_\_-layer protocols are the front ends to the lower-layer protocols in the TCP/IP stack.
Answer    
Internet 
   Network 
   Transport 
   Application

Answer 24

Application

Question 25

The most widely used is protocol is \_\_\_\_.
Answer    IPX/SPX 
   ATM 
   TCP/IP 
   NetBIOS

Answer 25

TCP/IP

Question 26

UDP stands for \_\_\_\_.
Answer    User Datagram Protocol 
   Universal Datagram Protocol 
   User Data Packet 
   Universal Data Packet

Answer 26

User Datagram Protocol

Question 27

To retrieve e-mail from a mail server, you most likely access port 119.

Answer 27

False

Question 28

What is ICMP used for?

Answer 28

Internet Control Message Protocol (ICMP) is used to send messages that relate to network operations. For example, if a packet cannot reach its destination, you might see the “Destination Unreachable” error. ICMP makes it possible for network professionals to troubleshoot network connectivity problems (with the Ping command) and to track the route a packet traverses from a source IP address to a destination IP address (with the Traceroute command).

Question 29

What is DNS used for?

Answer 29

Most networks require a DNS server so that users can connect to Web sites with URLs instead of IP addresses. When a user enters a URL, such as www.yahoo.com, the DNS server resolves the name to an IP address. The DNS server might be internal to the company, or each computer might be configured to point to the IP address of a DNS server that’s serviced by the company’s ISP.

Question 30

What steps are involved in TCP’s “three-way handshake”?

Answer 30

Answer:

1. Host A sends a TCP packet with the SYN flag set (that is, a SYN packet) to Host B.
2. After receiving the packet, Host B sends Host A its own SYN packet with an ACK flag (a SYN-ACK packet) set.
3. In response to the SYN-ACK packet from Host B, Host A sends Host B a TCP packet with the ACK flag set (an ACK packet).

Question 31

A hex number is written with two characters, each representing a byte.

Answer 31

False

Question 32

An octal digit can be represented with only three bits because the largest digit in octal is seven.

Answer 32

True

Question 33

Based on the starting decimal number of the ____ byte, you can classify IP addresses as Class A, Class B, or Class C.

Answer 33

first

Question 34

What is the main protocol for transmitting e-mail messages across the Internet

Answer 34

SMTP

Question 35

What is the primary protocol used to communicate over the World Wide Web?

Answer 35

HTTP

Question 36

What allows allows different operating systems to transfer files between one another

Answer 36

FTP

Question 37

What is primarily used to monitor devices on a network, such as remotely monitoring a router’s state?

Answer 37

SNMP

Question 38

What is a TCP header flag used to deliver data directly to an application?

Answer 38

PSH

Question 39

What enables multiple users to communicate over the Internet in discussion forums?

Answer 39

IRC

Question 40

What is a TCP header flag that signifies the beginning of a session called?

Answer 40

SYN

Question 41

What enables a remote user to log on to a server and issue commands?

Answer 41

SSH

Question 42

What is a TCP header flag that is used to signify urgent data called?

Answer 42

URG

Question 43

In a(n) ____, the tester does more than attempt to break in; he or she also analyzes the company’s security policy and procedures and reports any vulnerabilities to management.

Answer 43

security test

Question 44

____ takes penetration testing to a higher level.

Answer 44

Security testing