ROC II, Course I, Lesson 8

The Data Over Cable Systems Interface Specification (DOCSIS) MAC (Media Access Control) Layer maps to which Open Systems Interconnection (OSI) reference model layer?

Data Link Layer

True or False. Cell phone to cell phone connection is an example of a connectionless protocol.

False

True or False. Data will always be transported over the shortest route between host network devices.

False

True or False. Forward error correct (FEC) in the datagram will repair errors during transport.

False

True or False. The DOCSIS MAC Layer replaces the OSI model's Physical Layer so that media access control (MAC) can be used by the CMTS to differentiate between cable modems.

False

True or False. The DOCSIS cable modem has one interface that connects to one network.

False

In the Internet protocol (IP) suite, which layer is the IP header information added to become an IP packet that contains the IP addresses of both hosts?

Internet Layer

What provides quality of service (QoS) monitoring to synchronize multiple RTP streams?

RTCP

What protocol is stacked on top of UDP?

RTP

What controls an RTP session?

RTSP

Which protocol is stacked on top of the user datagram protocol (UDP) to break the data into smaller units and add application-layer headers that contain a timestamp and sequence number for real-time TV delivery?

Real-Time Transport Protocol (RTP)

True or False. An answering machine is an example of a connectionless protocol.

True

True or False. Layer 1 through Layer 4 of the OSI model are specific to cable networks and are present only between the cable modem and the cable modem termination system (CMTS).

True

True or False. Low-overhead user data protocol (UDP) is typically used to for real-time applications such as telephone and TV, which can tolerate some packet loss in exchange for near-immediate delivery of the data-packet applications.

True

True or False. The DOCSIS Physical Layer specifies the modulation and access techniques for communications over a hybrid fiber/coax (HFC) network.

True

True or False. The route between host network devices is congestion free and all packets will arrive intact and in the correct sequence.

True

How is the five-layer Internet protocol (IP) suite formed?

by breaking the Network Access Layer from the four-layer IP suite into the Data Link Layer and the Physical Layer

Which of the following is an example of how a connection-oriented protocol works?

calling someone on the telephone and hearing somebody say "hello" on the receiving end before speaking

The rules or standards implemented with hardware, software, or a combination of the two that enable devices to connect and then transfer data to each other are __________ .

computer protocols

Why would a media file be downloaded rather than played back in real-time?

downloaded media files without digital rights management (DRM) restrictions can be played back without an Internet connection, such as when traveling in a car or flying

What delays reception of data transported using the transmission control protocol (TCP)?

extra data being sent for sequencing of segments by TCP creates overhead that delays reception of data

In the Internet protocol (IP) suite, what are the IP packets called after the Network Access Layer adds the header at the beginning of the IP packet and data, called a trailer, at the end of the packet?

frames

Which of the following best describes the Open Systems Interconnection (OSI) reference model?

model that organizes the processes of network communications functions and services by network hardware and software into one of seven categories called layers

The delivery of a TV channel over a broadband cable network follows an informal set of __________ as the channel is processed in the headend before transport and again when received at the customer premises.

peer communications

What is the term for a receive function or protocol that reverses the processing or protocols involved to send a signal?

peer communications

__________ requires a peer function or protocol at the receiver that reverses the processing functions or protocols to send a signal.

peer communications

For communications, what is required of the receiver?

peer function or protocol that reverses the processing functions or protocols to send a signal

Which layers of the Open Systems Interconnection (OSI) reference model will a technician most likely be familiar with?

physical, data link, network, transport

What is stacked on top of the user datagram protocol (UDP) to provide real-time applications with specific functions?

real-time transport protocol (RTP)

What does the transmission control protocol (TCP) add to the headers of each segment that are used by the receiving host to reassemble the segments in the correct order?

sequence numbers

Which protocol is used for applications that place a higher priority on the delivery of intact and error-free data, such as email and file transfers, and less on timely data delivery?

transmission control protocol (TCP)