Introductory Networking

Question 1

OSI model layers (7)

Answer 1

Application
Presentation
Session
Transport
Network
Data link
Physical

Question 2

Layer 7 - Application

Answer 2

• provides networking options to programs running on a PC

- work with apps - providing an interface to them to transmit data

Question 3

Layer 6 - Presentation

Answer 3

• data from application layer is standardised to format that receiving PC can understand (encryption, compression, other transformation)

Question 4

Layer 5 - Session

Answer 4

• set a connection with remote PC
• if cannot - sends back an error
• if can - maintain connection
• unique sessions

Question 5

Layer 4 - Transport

Answer 5

• choose the protocol (common TCP or UDP)

- divided to bite-sized pieces (TCP - segments, UDP - datagrams)

Question 6

Layer 3 - Network

Answer 6

• logical addressing
• IP
• locating a destination PC
• best path to take
• packet is generated

Question 7

Layer 2 - Data link

Answer 7

• physical addressing
• MAC
• check of corruption
• ready for transmission
• frames

Question 8

Layer 1 - Physical

Answer 8

• binary to signal and visa versa

- stream of bits

Question 9

DNS Servers (types, where are domains stored, hierarchy)

Answer 9

• 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