Introductory Networking Flashcards
1
Q
OSI model layers (7)
A
Application Presentation Session Transport Network Data link Physical
2
Q
Layer 7 - Application
A
- provides networking options to programs running on a PC
- work with apps - providing an interface to them to transmit data
3
Q
Layer 6 - Presentation
A
- data from application layer is standardised to format that receiving PC can understand (encryption, compression, other transformation)
4
Q
Layer 5 - Session
A
- set a connection with remote PC
- if cannot - sends back an error
- if can - maintain connection
- unique sessions
5
Q
Layer 4 - Transport
A
- choose the protocol (common TCP or UDP)
- divided to bite-sized pieces (TCP - segments, UDP - datagrams)
6
Q
Layer 3 - Network
A
- logical addressing
- IP
- locating a destination PC
- best path to take
- packet is generated
7
Q
Layer 2 - Data link
A
- physical addressing
- MAC
- check of corruption
- ready for transmission
- frames
8
Q
Layer 1 - Physical
A
- binary to signal and visa versa
- stream of bits
9
Q
DNS Servers (types, where are domains stored, hierarchy)
A
- domain can be stored in PC’s local cache
- the recursive server is stored in your router
- 13 root name servers
- Top-Level domain (TLD) servers - extensions
- Authoritative name server - actual domains