Exam 2 Quizzes - Cybersecurity

PDU at the data link layer is called a __________.

frame

For digital circuits, we can ____________ to strengthen the signal. This is because the signal is recreated without the accompanying noise and distortion, resulting in lower error rates.

install repeaters

Which of the following is NOT TRUE about Continuous ARQ? it is a full-duplex transmission technique it provides flow control it sends one message at a time it uses ACK and NAK packets

it sends one message at a time

The data link layer performs media access control (MAC). Which of these is a basic approach to MAC?

roll-call polling token passing contention

The PDU at the transport layer is called a

segment

The data link layer has two sublayers. Which sublayer controls the physical hardware?

MAC

An example of a network layer address is: 129.79.127.4 www.ou.edu 00-0C-00-F5-03-5A 307 West Brooks St, Norman OK 73019

129.79.127.4

How long is the address field of IPv6?

16-byte

An IP address of www.hp.com (Links to an external site.) (Hewlett-Packard) resolves to 15.192.45.22. What class of address is this?

A

When a computer needs to resolve the MAC address of the next hop, it issues the following packet:

ARP request

Which of the following protocols are routing protocols (check all that apply)? BGP RIP DHCP OSPF ICMP EIGRP

BGP RIP OSPF ICMP EIGRP

This packet is sent to resolve an application layer address into an IP address.

DNS request

Transport Layer responsibilities are (check all that apply): Routing Linking to the Application Layer using a Port# Addressing Segmentation Session Management

Linking to the Application Layer using a Port# Segmentation Session Management

Both TCP and UPD use this same way to link to the Application Layer

Port#

The responsibilities of the Network Layer are (check all that apply): Routing Addressing Segmentation Session Management Linking to Application Layer via a Port#

Routing Addressing

Which protocol handles breaking a large data stream into pieces and ensures that the packets are reliably delivered from end-to-end?

TCP

There is a trade off between large and small frames when designing a protocol. Small frames are less efficient but are less likely to contain errors and cost less to retransmit if there is an error.

TRUE

TCP is a protocol that lives on this layer:

Transport

UPD is a protocol that lives on this layer

Transport

Subnet mask must be a continuous stream of 1s.

True

There are many sources of error. Which of these refers to the (usually gradual) loss of signal strength during transmission through a medium?

attentuation

This type of MAC works better in networks with large number of computers on any shared circuit.

controlled

The only way to detect errors is to send extra data with each message. Which of these methods is methods is the most reliable?

cyclic redundancy check

Which type of routing protocol meets the following criteria: The routing decisions are made in a decentralized manner by individual computers.

dynamic routing

What is part of error control?

error prevention error detection error correction