Module 2 / Unit 1 Internet Protocol Flashcards
On completion of this unit, you will be able to: □ Describe the format of IPv4 packets and addresses. □ Understand the operation of a subnet mask and the basics of IP routing. □ Use the ipconfig / ifconfig / ip tools to verify the IP configuration. □ Describe the operation of ICMP and use the ping utility.
What is the function of the protocol field in an IPv4 header?
Indicates the protocol type of the payload. This would typically be TCP or UDP but could be something else (ICMP or GRE for instance).
Convert the decimal value “72” into binary.
1001000
Convert the binary value “11110010” to decimal
242
Once installed, how would you check the TCP/IP configuration?
Run ipconfig or ifconfig.
True or false? A router will not forward a packet when the TTL field is zero.
True
Which of the protocols included with TCP/IP reports messages and errors regarding packet delivery?
Internet Control Message Protocol (ICMP).
True or false? Receiving an echo reply message indicates that the link between two hosts is operational.
True
True or false? The ipconfig utility can be used to empty the DNS cache.
True (though this functionality is not available in ifconfig).
If you have a workstation that cannot connect to a server, what is the first test you could perform to establish whether the cabling is OK?
ping another local system.
On a UNIX host, which TCP/IP parameters must be defined for the host to be able to communicate with hosts on a remote network?
IP Address, Subnet Mask, Default Gateway (address of the router).
