Network Security pt.2 Flashcards
What are the 5 TCP/Ip layers?
Application Transport Network Data Link Layer Physical Layer
What does TCP stand for?
Transmission Control Protocol
What identifies a TCP connection?
> source IP
destination IP
source TCP port
destination TCP port
What is an IP address and port number pair called
a socket
What does the Sequence Number do?
specifies the position of the segment data in the communication stream.
What does the acknowledgement number do?
specifies the position if the next byte expected from the communication partner
what does SYN do?
request for the synchronisation of SYN/ACK numbers
what does ACK do?
states the acknowledgment number is valid
what does FIN do?
request to shutdown one stream
what does RST do?
request to immediately reset the connection
what does URG do?
states that the urgent pointer is valid.
what is ICMP used for?
to exchange control/error messages about the delivery of IP datagrams
what is echo request/reply used for?
to test connecdtivity
what is redirect used for?
to inform hosts about better routes
what is destination unreachable used for?
to inform a host of the impossibility to deliver traffic to a specific destination
what does time exceeded do?
report expired datagrams
what does an address mask request/reply do?
determines the subnet mask in use on the local number
what does a timestamp request/reply do?
synchronise clocks
what does a parameter problem do?
informs about errors in the IP datagram fields
how does the traceroute program use time exceeded messages?
to determine the path used to deliver a datagram.
what does ARP stand for?
address resolution protocal
What does the OP field of an ARP message specify?
if this is an ARP request or an ARP reply
