CPSC 353 Final

Propagation delay (time) is the ratio of ______________________.

distance to propagation speed

The source port number on the UDP user datagram header defines _______.

the process running on the sending computer

The application layer in the TCP/IP protocol suite is usually considered to be the combination of ________ layers in the OSI model

application, presentation, and session

In TCP, the size of the send window is the ________ of rwnd and cwnd.

minimum

Ethernet provides which of the following services to the network layer

error detection

_______ is (are) a channelization protocol.

All the choices are correct. (FDMA, TDMA, CDMA)

The stop-and-wait protocol is highly inefficient when

when there is a large distance between source and destination and the transmission rate is high

How many devices are estimated to be connected to the Internet by 2020

25 billion

Internet Standards are developed by

The Internet Engineering Task Force (IETF)

Traditional Telephone Networks use

circuit switching

Geostationary satellites have a propagation delay of __________ milliseconds

280

The terms "host" and "end system" mean the same thing

True

The acronym "LTE" stands for

Long Term Evolution

The Internet uses

packet switching

The cabling commonly used for computer networks switching a building is

Unshielded Twisted Pair

Transmission Delay is the amount of time a packet traveling on the wire between the source and destination.

False

Processing Delay is the length of time a packet must wait at a router before it is transmitted

False

The amount of time required for a host to push out a packet is the

Transmission Delay

In the TCP/IP protocol suite, which of the following is an application layer protocol?

The Hypertext Transfer Protocol (HTTP)

In the TCP/IP protocol suite, which of the following is a transport layer protocol?

The Transmission Control Protocol (TCP)

In the TCP/IP protocol suite, which of the following is a network layer protocol?

The Internet Protocol (IP)

The most popular social network in China is

WeChat

Which of the following is NOT a type of Denial-of-Service (DoS) Attack?

Phishing Attack

Packet Switching was developed between

1961 and 1972

Malware that require some form of user interaction to infect a user's device are called

Viruses

Malware that can enter a device without any explicit user interaction are called

Worms

_______ was formed to connect universities with no access to ARPAnet.

CSNET

Internet standards are developed by

The Internet Engineering Task Force

In TCP/IP, a logical connection between an entity at the link layer can be made with another entity at the ________ layer.

link

The Internet provides its applications two types of services, a TDM service and a FDM service.

False

In the TCP/IP protocol suite, the physical layer is concerned with the movement of _______ over the physical medium.

individual bits

With a residential DSL service, each subscriber gets more downstream bandwidth than upstream bandwidth.

True

In TCP/IP, a transport layer segment is encapsulated in a packet at the ________ layer.

network

The _________ layer is responsible for the delivery of a message from one process to another.

transport

Propagation delay is the amount of time it takes to push all of a packets bits into the link

False

A local area network (LAN) is _______________.

a wired network using Ethernet

The TCP protocol provides timing guarantees.

False

One of the most compelling features of client-server architectures is their self-scalability

False

Choose the protocols that use the client-server paradigm (give two answers by reponding twice)

HTTP (HyperText Transfer Protocol)

FTP (file transfer protocol)

In a client-server paradigm, a _______ program provides services to a (another) _______ program

server; client

A process sends messages into, and receives messages from, the network through a software interface called a __________

socket

In a client-server paradigm

the server must be running all the time but the client needs to be running only when it is needed.

Choose the protocols that use the peer-to-peer paradigm

BitTorrent

Skype

An HTTP server maintains no information about its clients

True

HTTP can use both persistent and non-persistent connections

True

HTTP uses TCP as its underlying transport layer protocol

True

Each line in an HTTP request message, before the entity body, is terminated with

An ASCII 13 character followed by an ASCII 10 character

The HTTP protocol is stateless, but a web server can identify users by using

cookies

SMTP is primarily a __________ protocol.

push

When an SMTP connection is established, the first message is passed

from the client to the server

The components of the Internet mail system include:

user agents

mail servers

the Simple Mail Transfer Protocol

all of the above

all of the above

The standard port for connecting to an SMTP server is

25

SMTP restricts the body of all mail messages to simple 7-bit ASCII

True

To close an SMTP session, the client will send the message _________ to the server

QUIT

___________ is more efficient over a low-bandwidth connection

POP3

The main purpose of DNS is to translate IP addresses into host names

False

A host with a complicated hostname can have one or more alias names. The real hostname is said to be a _____________ hostname

canonical

The number or root name servers in the world is about

400

DNS can use a combination of Iterative Queries and Recursive Queries

True

The DNS protocol runs primarily over _ and uses port ___

UDP; 53

The "com" Top Level Domain servers are maintained by

Verisign

Choose the best answer:

The DNS is a distributed database implemented in a hierarchy of DNS servers

The DNS is an application layer protocol that allows hosts to query the distributed database

The DNS servers are often UNIX machines running the Berkeley Internet Name Domain (BIND) software.

All of the above

All of the above

The unchoked peers are the ________ peers from which a BitTorrent client is receiving data at the highest rate.

four

Compressed Internet video typically ranges from ____ kbps for low-quality video to ___ Mbps for streaming high-definition movies

100, 3

The two typical server placement philosophies adopted by Content Distribution Networks are ___ and ___

enter deep, bring home

The collection of all BitTorrent peers participating in the distribution of a particular file is called a

torrent

When a peer joins a torrent, it registers itself with an infrastructure node called a ___________ and periodically informs this node that it is still in the torrent.

tracker

It is possible for a mail client to send e-mail messages over HTTP rather than SMTP.

True

An e-mail message contains a ________ and a __________.

header; body

In BitTorrent, a peer's instantaneous download rate can never exceed its instantaneous upload rate.

False

The Date: header in the HTTP response message indicates when the object in the response was last modified.

False

Skype relay nodes are typically peers under the control of Skype users.

True

A _______ server is a computer that, when it receives a DNS reply, temporarily stores the mapping in its local memory.

caching

A registrar, a commercial entity accredited by ________, verifies the uniqueness of a domain name request and enters the domain into the DNS database.

ICANN

In the domain name space, a full domain name is a sequence of labels separated by ________.

Dots

A server that holds the publicly accessible DNS records that map the names of an organizations publicly accessible hosts to their IP addresses is called a ___________ server

Authoritative DNS

The first section of a URL identifier is the __________.

protocol

A message access protocol is a ________ protocol.

pull

Congestion control is provided by

TCP

Transport layer packets are known as tranport layer _____________ in Internet terminology

segments

TCP provides ___________ service to the invoking application

reliable, connection-oriented

The job of delivering the data in a transport-layer segment to the correct socket is called multiplexing

False

A transport layer protocol provides logical communication between

processes

Web servers can use one process for multiple client connections.

True

The port numbers from 0 to _____ are called well-known port numbers

1023

The job of gathering data chunks at the source host from different sockets, encapsulating each data chunk with header information to create segments, and passing the segments to the network layer is called _____________________

multiplexing

The UDP header has _____ fields

four

UDP provides finer application-level control over what data is sent, and when, than TCP

True

A reliable transport protocol is always preferable to an unreliable one.

False

UDP (User Datagram Protoc) provides ___________ service to the invoking application

unreliable, connectionless

A port number is _______ bits long.

16

Pipelining requires which of the following:

transmitting many packets before receiving acknowledgements

unique sequence numbers for each in-transit packet

sender-side buffering of unacknowledged packets

all of the above

all of the above

GBN stands for __________

Go Back N

An ARQ protocol requires:

Error detection

Receiver Feedback

Retransmission

All of the above

All of the above

A solution to the problem of duplicate packets is to add a new field to the data packet and have the sender number its data packets by putting a __________ number into this field

sequence

To handle the presence of bit errors, an ARQ protocol requires:

Error detection

Receiver feedback

Retransmission

All of the above

All of the above

TCP uses _________________ to check the safe and sound arrival of data.

an acknowledgment mechanism

A TCP connection provides __________ duplex service

full

There are _____ bits in the TCP sequence number field

32

The __________ state in Reno TCP is a state somehow between the slow start and the congestion avoidance states.

congestion recovery

congestion detection

slow recovery

None of the choices are correct

None of the choices are correct