Intro to networks 14-15

What part of URL, ht​tp://ww​w.cisco.com/index.html, represents top-level DNS domain?

.com

What is the complete range of TCP and UDP well-known ports?

0 to 1023

Assume a host with IP address 10.1.1.10 wants to request web services from a server at 10.1.1.254. Which of the following would display the correct socket pair?

10.1.1.10:1099, 10.1.1.254:80

Which number or set of numbers represents a socket?

192.1681.1:80

How many connections are required by FTP between client and server?

2

Which of these ports are used by FTP?

20 21

Which of the following DNS record types is used to resolve IPv6 addresses?

AAA

Which two operations are provided by TCP but not by UDP?

Acknowledging received data Retransmitting any unacknowledged data

This layer of OSI model is concerned with protocols that exchange data between programs running on hosts.

Application

Which TCP/IP model layer is closest to end user?

Application

These three OSI layers define the same functions as the TCP/IP model application layer.

Application Presentation Session

Which peer-to-peer application allows users to share pieces of many files with each other at the same time?

BitTorrent

Which statement is true about FTP?

Client can download data from or upload data to server.

Which action is performed by client when establishing communication with server via use of UDP at transport layer?

Client randomly selects source port number

What is a socket?

Combination of source IP address and port number or destination IP address and port number

Which of the following is displayed by nslookup utility?

Configured default DNS server

Which UDP header statement is true?

Consists of 4 fields in 8 byte header

Which three are transport layer responsibilities?

Conversion multiplexing Segmenting data and resembling segments Tracking individual conversions

What are two characteristics of application layer of TCP/IP model?

Creation and maintenance of dialogue between source and destination applications closest to end user

A wireless host needs to request IPv4 address. What protocol would be used to process request?

DHCP

Which two are protocols that belong in OSI application layer?

DNS SMTP

Which two services or protocols use preferred UDP protocol for fast transmission and low overhead?

DNS VolP

Which two fields are the same in TCP and UDP header?

Destination and source port number

How does a networked server manage requests from multiple clients for different services?

Each request has combination of source and destination port numbers, coming from unique IP addresses

Function of OSI session layer.

Exchange of information to imitate dialog between peers

Which two applications would use TCP transport layer protocol?

FTP HTTP

Peer-to-peer networking model requires implementation of dedicated server for data access HTTP is secure protocol. DNS server that receives request for name resolution that is not within its DNS zone will send failure message to requesting client. DHCP clients send DHCP request message to available DHCP servers. Resource sharing over SMB is only supported on Microsoft operating systems.

False

What message type is used by HTTP client to request data from web server?

GET

This protocol is used by web browser to establish a connection to web server.

HTTP

Which three protocols or standards are used at application layer of TCP/IP model?

HTTP MPEG GIF

Which protocol uses encryption?

HTTPS

When retrieving email messages, which protocol allows for easy, centralized storage and backup of emails that would be desirable for a small- to medium-sized business?

IMAP

Which TCP header statement is true?

It consists of 10 fields in 20-byte header.

Which is a feature of IMAP?

It downloads copy of email messages leaving original on server.

Why is DHCP for IPv4 preferred for use on large networks?

It is a more efficient way to manage IPv4 addresses than static address assignment is.

Why is UDP desirable for protocols that make a simple request and reply transactions?

Low overhead

Which two tasks can be performed by local DNS server?

Mapping name-to-IP addresses for internal hosts forwarding name resolution requests between servers

Which of the following DNS resource record types resolves authoritative name servers?

NS

Which protocol can be used to transfer messages from an email server to an email client?

POP3 (Post Office Protocol)

This message type is used when uploading data files to web server.

POST

What happens if part of an FTP message is not delivered to destination?

Part of FTP message that was lost is re-sent.

MKV, GIF, and JPG standards are associated with which OSI layer?

Presentation

Which application layer protocol is used to provide file-sharing and print services to Microsoft applications?

SMB

This protocol is used by client to send email to mail server.

SMTP

Which control bit flags are used during three-way handshake?

SYN and ACK

What happens when sending host senses there is congestion?

Sending host reduces number of bytes it sends before receiving acknowledgment from destination host.

What field is used by destination host to reassemble segments into original order?

Sequence Number

What TCP mechanism is used to enhance performance by allowing device to continuously send steady stream of segments as long as device is also receiving necessary acknowledgements?

Sliding window

Which of the following would be valid source and destination ports for host connecting to email server?

Source 49152, Destination 25

Network congestion has resulted in source learning of loss of TCP segments that were sent to destination. What is one way that TCP protocol addresses this?

Source decreases amount of data that it transmits before it receives acknowledgement from destination.

Which of the following would be valid source and destination ports for host connecting to DNS server?

Source: 49152, Destination: 53

Which transport layer protocol ensures reliable same-order delivery?

TCP

Which transport layer feature is used to establish connection-oriented session?

TCP 3-way handshake

Which two applications would use UDP transport layer protocol?

TFTP VoIP

Which layer is responsible for establishing temporary (limited period of time) communication session between source and destination host applications?

Transport layer

In a peer-to-peer network environment every peer can function as both client and server FTP data transfers take place from client to server (push) and from server to client (pull).

True

Which of the following is stateless best-effort delivery transport layer protocol?

UDP

Which transport layer protocol statement is true?

UDP is best effort protocol

Which UDP datagram reassembly statement is true?

UDP reassembles data in order that was received

Which transport layer protocol would be used for VoIP applications?

User Diagram Protocol

Which of the following is a feature of the Gnutella protocol?

Users can share whole files with other users.

What field is used to provide flow control?

Windows size

On a home network, which device is most likely to provide dynamic IPv4 addressing to clients on the home network?

a home router

What type of applications are best suited for using UDP?

applications that are sensitive (detect) to delay

An author is uploading one chapter document from a personal computer to a file server of a book publisher. What role is personal computer assuming in this network model?

client

How many exchanges are needed to end both sessions between two hosts?

four exchanges

Which Windows command would display protocols in use, local address and port numbers, foreign address and port numbers, and connection state?

netstat

What is the purpose of using source port number in TCP communication?

to keep track of multiple conversations between devices

What is a responsibility of transport layer protocols?

tracking individual conversations

Which port group includes port numbers for FTP, HTTP, and TFTP applications?

well-known ports