Bus 441 Exam 1

Front 1

DDoS attacks are attacks on

Back 1

Availability

Front 2

In the TC/IP architecture, which layer is responsible for transmission of packets between networks

Back 2

Internet layer

Front 3

How will a stateful packet inspection (SPI) firewall handle an incoming packet containing a TCP SYN segment?

Back 3

Process it through the Access Control List (ACL)

Front 4

Transport Layer: Host P transmits a SYN to Host Q. If host Q is willing to open the connection, it will transmit a _________ segment

Back 4

SYN/ACK

Front 5

A message always has a ___________

Back 5

Header

Front 6

In an Ethernet frame, the IP packet is carried in the _________ field

Back 6

Data

Front 7

In the TCP/IP architecture, which layer is responsible for facilitating communication within a single network?

Back 7

Data link layer

Front 8

In the TCP/IP architecture, which layer is responsible for the bit-by-bit transmission of the data?

Back 8

Physical layer

Front 9

In the TCP/IP architecture, which layer is responsible for facilitating communication between two computers, regardless of their platforms or internal hardware?

Back 9

Transport layer

Front 10

Transport Layer: If the destination host does not receive the segment, it will ___________

Back 10

Transmit nothing

Front 11

Alice is going to make an online purchase at petsmart.com. She wants to ensure that her credit card number will be encrypted when she places the order. Where does Alice's computer obtain petsmart.com's public key?

Back 11

From the petsmart.com digital certificate

Front 12

Jitter is a problem for _________

Back 12

VoIP and Streaming Media

Front 13

Transmission speed is normally measured in __________

Back 13

Bits per second

Front 14

Which of the following places a heavier burden on the internet? TCP or UDP or both

Back 14

TCP

Front 15

The most popular symmetric key encryption cipher today is ____________

Back 15

AES

Front 16

Source and destination port numbers are found in the header of ___________

Back 16

TCP segments

Front 17

In the TCP/IP architecture, which layer is responsible for facilitating communication between two applications?

Back 17

Application layer

Front 18

An attacker must break through two firewalls to get to a host. This illustrates the principle called __________

Back 18

Defense in depth

Front 19

Passwords are widely used because they offer very strong authentication

Back 19

False

Front 20

B2-CC-67-0D-5E is a valid MAC address

Back 20

False

Front 21

Packet switching saves money by multiplexing conversations over a single line

Back 21

True

Front 22

If an Ethernet frame passes from a source computer through two Ethernet switches, then to the destination computer, how many data links will there be?

Back 22

One

Front 23

Abigail and Bert are using a public-private key encryption to exchange information. They want to ensure all of their communications remain confidential. Abigail will use __________ to encrypt a message for Bert. Bert will use __________ to decrypt the message. Bert will use _________ to encrypt a message for Abigail.

Back 23

Bert's public key, Bert's private key, Abigail's public key

Front 24

How long are IPv6 addresses?

Back 24

128 bits

Front 25

One of the major protocols discussed in class thus far, __________ is (are) connection-oriented

Back 25

TCP

Front 26

When a user is trying to visit a webpage, before the user PC can contact the webserver it must first contact the DNS server. What information does the user PC send to the DNS server? What information does the DNS server send back?

Back 26

The user sends the URL of the webpage in a DNS request. The DNS server sends the IP address of the webpage in a DNS response

Front 27

When I want to view the webpage for Barnes & Noble, a process occurs but it is not visible to me through my web browser interface. Describe the steps that occur in a TCP session for such an example. Be sure to mention how error detection and correction might occur during this session.

Back 27

The TCP session beings with my computer sending a SYN to the B&N webserver, to start the 3-way Open. Once the TCP connection is open, the HTTP request/response cycle occurs, followed by the 4-way Close. Error detection: if a host receives an ACK, then it knows the segment was received. If a host does not receive an ACK, then it retransmits the segment (error correction).

Front 28

Applications that must flow in real time (ex. voice over IP) typically use _________ as the standard at the Transport layer

Back 28

UDP

Front 29

When messages of different users share a transmission line, this is _________

Back 29

Mutliplexing

Front 30

How long are IPv4 addresses?

Back 30

32 bits

Front 31

Social Engineering is an old hacker technique, and therefore it does not work well today.

Back 31

False

Front 32

A client is attempting to send an HTTP request. After the internet layer process on the client does encapsulation, it passes the IP packet to the _______ layer process

Back 32

Data link

Front 33

Throughput is __________

Back 33

The speed a network actually provides to users

Front 34

What is (are) the well-known port number(s) for HTTP?

Back 34

80

Front 35

An attack in which an authentic-looking email or website entices a used to enter his or her username, password, or other sensitive information is called ___________

Back 35

Phishing

Front 36

Overprovisioning means ____________

Back 36

Adding much more switching and transmission line capacity than will be needed most of the time

Front 37

UDP checks messages for errors but does not correct them. UDP is ___________

Back 37

Unreliable

Front 38

In TCP, the receiver sends ___________

Back 38

An ACK if the message is received correctly

Front 39

At what layer is the EUI-48 address added to an outgoing message?

Back 39

Data link