Ch.4 Your Computer on the Network Flashcards
What does the “host” command do ?
Finds the IP address of a domain name
How to use “host” cmd ?
host domain_name
ex: host wgu.edu
What does the “dig” command do ?
Returns more detailed information about domains
How to use “dig” cmd ?
dig domain_name
What is a “socket” ?
communication endpoint for two programs talking to each other.
What does a “Unix socket” do ?
Which connect processes running on the same device.
What does a UDP (User Datagram Protocol) Socket do ?
connect applications using a protocol which is fast but not resilient.
What does a TCP (Transmission Control Protocol) Socket do ?
connects apps more reliabley than UDP sockets and, for example, confirm the receipt of data
What does the “ss” command do ?
allows an administrator to investigate all of the sockets on a Linux computer
What does “ss -4” and “ss - 6” do ?
filter between ipv6 and ipv4 protocols
What is a MAC Media Access Control Addresses address ?
used to identify individual devices in a local network
What is the command to display network interfaces and MAC addresses ?
“ip link show”
What are IP addresses and why are they needed ?
globally unique addresses are needed in order to implement routing across multiple link layers
How many bits are the IPV4 addresses ?
IPv4 addresses are 32 bits
