DNS and Packet switching

What does DNS stand for?

• Domain Name System

• Domain Nomenclature Service

• Dynamic Naming Service

• Do Not Send

What is the purpose of the DNS?

• Turns human friendly domain names into IP addresses

• Turns human friendly domain names into MAC addresses

• Turns IP addresses into domain names

• Turns MAC addresses into IP addresses

Where is the first place that the browser will check for an IP address for a frequently visited web site?

• The top level domain server

• The root domain server

• The browser cache

• The ISP DNS resolver

How is a data file sent across a network such as the internet?

• As a complete file

• The file is broken up into individual packets

• It can be sent whole or as packets, depending on how busy the network is.

Fill in the blank: The internet is a ______ switched network

Fill the blank: ______ Name System

What is an advantage of packet switching?

• All packets take the same route

• Packets can take their own route depending on network conditions

• The packets all arrive in the correct order

• The file can all be sent in one go

Which addresses will be included in the packet header?

• E-mail

• Web address

• Source and destination IP address

• Destination MAC address

Why is the source IP address included in the packet header?

• It isn't, only the destination

• So that the destination computer can acknowledge receipt

• So that the packets can be put in the correct order

• So that lost packets can be deleted

Fill in the blank: TTL - Time to ____ counter