Deck 11: Module A: Networking Concepts

Question 1

At what core layer do you find WAN standards?

A) Single-network
B) Internet
C) Application
D) None of the above.

Answer 1

A

Question 2

Intercepting wireless LAN transmissions is difficult.

Answer 2

False

Question 3

The organization that funded the creation of the Internet is ________.

A) the IETF
B) ISO
C) DARPA
D) the National Science Foundation

Answer 3

C

Question 4

In this book, when internet is spelled with a capital I, it means the global Internet.

Question 5

If two hosts are separated by seven networks, how many packets will there be along the way when a host transmits a packet to another host?

A) 1
B) 2
C) 7
D) 14

Question 6

Single-network core standards are for message delivery through ________.

A) LANs
B) WANs
C) Both A and B
D) Neither A nor B

Question 7

User computers connect to ________ switches.

A) core
B) primary
C) workgroup
D) terminal

Question 8

Attackers can read signals traveling over UTP without tapping the cord.

Question 9

The terms octet and byte mean the same thing.

Question 10

Packets are carried inside frames.

Question 11

If two hosts are separated by five networks, how many frames will there be along the way when a host transmits a packet to another host?

A) 1
B) 2
C) 5
D) 10

Question 12

A device attached to a network is called a ________.

A) client
B) server
C) host
D) Neither A nor B

Question 13

A residential access router usually contains ________.

A) a DHCP server
B) an Ethernet switch
C) Both A and B
D) Neither A nor B

Question 14

A network that runs on the customer premises is a ________.

A) LAN
B) WAN
C) Both A and B
D) Neither A nor B

Question 15

Security problems with protocols include ________.

A) a lack of security in earlier versions
B) awkwardly added security
C) Both A and B
D) Neither A nor B

Question 16

Companies use carriers for WAN transmission because ________.

A) companies lack rights of way
B) carriers have extremely strong security
C) Both A and B
D) Neither A nor B

Question 17

Frames are messages traveling through ________.

A) LANs
B) WANs
C) Both A and B
D) Neither A nor B

Question 18

When your mobile phone is on a network, it is a host.

Question 19

When your home PC is on a network, it is a host.

Question 20

In internets, different networks are connected by ________.

A) switches
B) routers
C) Both A and B
D) Neither A nor B

Question 21

In the IETF, a proposed standard is called a Request for Comments.

Question 22

A route is the path a frame takes across a single network, from the source host to the destination host, across multiple switches.

Question 23

Physical and data link layer standards govern transmission in ________.

A) LANs
B) WANs
C) Both A and B
D) Neither A nor B

Question 24

What is the general function of the second row in the IPv4 header?

A) To give the source address
B) To give the destination address
C) To handle fragmentation and reassembly
D) None of the above.

Question 25

Which of the following is an OSI standards agency?

A) ISO
B) ITU-T
C) Both A and B
D) Neither A nor B

Question 26

The ________ layer in the hybrid TCP/IP-OSI architecture comes from OSI.

A) physical
B) transport
C) Both A and B
D) Neither A nor B

Question 27

Most firms actually use the ________ architecture.

A) TCP/IP
B) OSI
C) IETF
D) None of the above.

Question 28

In ________, signals can be read without tapping the cord.

A) UTP
B) optical fiber
C) Both A and B
D) Neither A nor B

Question 29

The ________ standard is designed to prevent impostors from sending false supervisory messages to switches.

A) 802.1X
B) 802.1AE
C) Both A and B
D) Neither A nor B

Question 30

A computer connects to the nearest switch via a ________.

A) physical link
B) data link
C) Both A and B
D) Neither A nor B

Question 31

The ________ layer is roughly the same in OSI and TCP/IP.

A) transport
B) session
C) Both A and B
D) Neither A nor B

Question 32

A ________ is the path that a frame takes across a single switched network.

A) physical link
B) data link
C) route
D) connection

Question 33

Which organization creates Internet standards?

A) DARPA
B) IETF
C) ISO
D) TCP

Question 34

Spread spectrum transmission is used in wireless LANs ________.

A) to increase transmission speed
B) for security
C) Both A and B
D) Neither A nor B

Question 35

The ________ field in a packet ensures that misaddressed packets will not circulate endlessly.

A) header checksum
B) TTL
C) Both A and B
D) Neither A nor B

Question 36

Spread spectrum transmission in wireless LANs provides security.

Question 37

If a router receives a packet with a TTL value of 1, what will it do?

A) Increase the TTL value to 2.
B) Keep the TTL value at 1.
C) Drop the packet.
D) None of the above.

Question 38

How many layers does the OSI architecture have?

A) 3
B) 5
C) 7
D) None of the above.

Question 39

________ is a standards architecture.

A) ISO
B) OSI
C) Both A and B
D) Neither A nor B

Question 40

The name of the Internet standards architecture is ________.

A) OSI
B) ISO
C) TCP/IP
D) All of the above.

Question 41

The IP header checksum field is used for error detection.

Question 42

Which of the following is true?

A) TCP works at the transport layer.
B) UDP works at the transport layer.
C) Both A and B
D) Neither A nor B

Question 43

In a TCP half-open DoS attack, ________.

A) the attacker sends the final ACK of a session opening
B) the attacker sends an RST segment
C) Both A and B
D) Neither A nor B

Question 44

A normal TCP close takes ________ segments.

A) 2
B) 3
C) 4
D) None of the above.

Question 45

A mask is needed to identify the size of the network part or of the combined network and subnet parts.

Question 46

The attacker sends a mal-formed TCP segment. The victim host sends back a TCP RST message. This exchange verifies that the victim host exists and has a certain IP address.

Question 47

In TCP, if a receiver receives a damaged TCP segment, it ________.

A) sends a negative acknowledgement
B) sends the segment back to the original sender
C) does nothing
D) None of the above.

Question 48

The subnet mask is one of the three parts of an IP address.

Question 49

IP options are used frequently.

Question 50

A flag field has the value 1.

A) The TCP segment is an acknowledgement.
B) The field is set.
C) The field is locked.
D) The router will reduce the value to 0 and drop the packet.

Question 51

IPsec works with ________.

A) IPv4
B) IPv6
C) Both A and B
D) Neither A nor B

Question 52

In an IPv4 packet, the ________ field describes the contents of the packet's data field.

A) TTL
B) header checksum
C) protocol
D) next-higher-layer

Question 53

The main advantage of IPv6 compared to IPv4 is ________.

A) support for more IP addresses
B) faster transmission
C) higher security
D) None of the above.

Question 54

A one-bit field is called a ________ field.

A) binary
B) singlet
C) TCP
D) flag

Question 55

An abrupt TCP close takes ________ segments.

A) 2
B) 3
C) 4
D) None of the above.

Question 56

TCP messages are called ________.

A) packets
B) frames
C) datagrams
D) segments

Question 57

A TCP session opening ends with a(n) ________ message.

A) SYN
B) FIN
C) ACK
D) URG

Question 58

TCP segment carries octets 4321 through 4371. What is its sequence number?

A) 4321
B) 4371
C) 4372
D) None of the above.

Question 59

IP addresses are 32 octets long.

Question 60

IPsec a general protection strategy for all internet, transport, and application protocols.

Question 61

TCP has a comprehensive security protocol comparable to IPsec for IP.

Question 62

Ping sends ________ messages and receives replies in the same protocol.

A) DNS
B) DHCP
C) ICMP
D) All of the above.

Question 63

________ tell the attacker that a certain IP address has a live host or router.

A) ICMP Echo replies
B) ICMP error messages
C) Both A and B
D) Neither A nor B

Question 64

UDP is a good protocol for applications that need reliability.

Question 65

ICMP ________.

A) is used in ping transmissions
B) is used for error messages
C) Both A and B
D) Neither A nor B

Question 66

A Windows host sends a TCP segment with source port number 1200 and destination port number 25. The sending host is a(n) ________.

A) client
B) TCP server
C) webserver
D) e-mail server

Question 67

TCP segment carries octets 4321 through 4371. The next segment carries no data. What is that segment's sequence number?

A) 4321
B) 4371
C) 4372
D) None of the above.

Question 68

________ places a relatively small traffic load on networks.

A) TCP
B) UDP
C) Both A and B
D) Neither A nor B

Question 69

TCP/IP's internet layer supervisory protocol is ________.

A) DNS
B) DHCP
C) ICMP
D) All of the above.

Question 70

To do TCP session hijacking, the attacker has to be able to predict the sequence number of the TCP segment currently being sent.

Question 71

Servers get ________.

A) static IP addresses
B) ephemeral IP addresses
C) dynamic IP addresses
D) None of the above.

Question 72

In DNS cache poisoning, an attacker replaces the IP address of a host name with another IP address.

Question 73

TCP electronic signatures ________.

A) do not exist
B) have automatic key exchange
C) Both A and B
D) Neither A nor B

Question 74

The TCP ________ field is designed to control the other party's transmission rate.

A) segment
B) flow
C) window
D) maximum

Question 75

________ uses options frequently.

A) IP
B) TCP
C) Both A and B
D) Neither A nor B

Question 76

An organization with a ________ domain name must maintain one or more DNS servers.

A) first-level
B) second-level
C) third-level
D) All of the above.

Question 77

TCP segment carries octets 4321 through 4371. What will be the acknowledgement number in the TCP segment that acknowledges this segment?

A) 4321
B) 4371
C) 4372
D) None of the above.

Question 78

DNSSEC ________.

A) is still under development
B) is widely used
C) is no longer used
D) There is no such thing as DNSSEC.

Question 79

Client usually get ________.

A) static IP addresses
B) ephemeral IP addresses
C) dynamic IP addresses
D) None of the above.

Question 80

A Windows host sends a TCP segment with source port number 1200 and destination port number 25. The receiving host is a(n) ________.

A) client
B) TCP server
C) webserver
D) e-mail server