Chapter 02: TCP/IP Concepts Review

What port does the Simple Mail Transfer Protocol, or SMTP service use?

25

What port does the Trivial File Transfer Protocol, or TFTP service use?

69

What port does the Hypertext Transfer Protocol, or HTTP service use?

80

What layer protocols operate as the front end to the lower-layer protocols in the TCP/IP stack?

Application

What layer, in the TCP/IP stack, do applications and protocols, such as HTTP and Telnet, operate?

Application

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

False

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

False

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

False

What TCP/IP protocol is used to send messages related to network operations and can be used to troubleshoot network connectivity?

ICMP

What 32-bit number tracks packets received by a node and allows the reassembling of large packets that have been broken up into smaller packets?

ISN

What layer, in the TCP/IP stack, is responsible for routing a packet to a destination address?

Internet

In the TCP/IP stack, what layer is concerned with physically moving bits across the network's medium?

Network

What TCP flag is responsible for synchronizing the beginning of a session?

SYN flag

What connection-oriented protocol is utilized by the Transport layer?

TCP

In the TCP/IP stack, what layer is concerned with controlling the flow of data, sequencing packets for reassembly, and encapsulating the segment with a TCP or UDP header?

Transport

No matter what medium connects computers on 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.

True

What TCP/IP protocol is fast, unreliable, and operates at the Transport layer?

UDP

What IP address is used as a loopback address and is not a valid IP address that can be assigned to a network?

127 address

What is the decimal equivalent of the binary number 11000001?

193

How many host computers can be assigned a valid IPv4 address when using a CIDR /24 prefix?

254

What port is typically reserved and utilized by the Secure Hypertext Transfer Protocol to create a secure connection to a Web server?

443

What port does the Domain Name System, or DNS service use?

53

What IPv4 address class has the IP address 221.1.2.3?

Class C

What TCP flag is responsible for delivering data directly and immediately to an application?

PSH flag

What type of network attack relies on guessing a TCP header's initial sequence number, or ISN?

Session hijacking

What protocol is the most widely used and allows all computers on a network to communicate and function correctly?

TCP/IP

What does the acronym TCP represent?

Transmission Control Protocol

What layer, in the TCP/IP protocol stack, is responsible for encapsulating data into segments?

Transport layer Next

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

True

What is the logical component of a TCP connection that can be assigned to a process that requires network connectivity?

port