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Summary: Internet Security
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Read the summary and the most important questions on Internet security
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1 Handout 1
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Data link layer
Packets are transformed to error free-frames. Uses HW adresses to transmit frames amongst physically conected devices. Divided into two sublayers: Logical link control (LLC): manages connections between two peers, providing error and flow control.
Media acces control (MAC): Transmits/receives frames. Logical topologies and HW adresses are defined here. -
What are the two functions of the internetprotocol?
Adressing: (IP of destination used until reached)
Fragmentation: Subdivision of packets depending on their size (it's a connectionless protocol, non error free. -
Routing information protocol (RIP)
Uses distance vector algorithms to determine direction and distance to any link. Selects the path with the least hops. -
What are the advantages and disadvantages of OSPF?
Advantage: smaller and more frequent updates
Disadvantage: Requires large amount of CPU and memory -
Border gateway protocol (BGP)
Replaces exterior gateway protocol for fully decentralized routing -
Internet control message protocol (ICMP) (two main catogories)
ICMP error messages and ICMP query messages -
Important functions of ICMP protocol
Announce network erros
Announce network congestion
Announce timeouts
Assist troubleshooting -
Example of an man in the middle attack? MITM
ICMP redirect attack -
What are the important protocols of the transport layer?
UDP (user datagram protocol) connectionless unreliable protocol
TCP (Transmission control protcol) connection-oriented reliable protocol ( providing integrity)
Guaranteed communication session via TCP three way handshake -
Architecture of presentation layer
Services:
Data conversion
Character code translation
Compression
Encryption/decryption
Sublayers:
CASE (Common application service element)
SASE (Specific application service element)
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