OSI LAYERS

Question 1

Layer 1

Answer 1

Physical Layer

Examples at Layer 1
● Ethernet Cables
● Fiber optic Cables
● Wi-Fi
● Bluetooth
● Hubs
● Wireless Access Points
● Media Converters

Question 2

Layer 2

Answer 2

Data Link

▪ Network Interface Cards (NIC)
▪ Bridges
▪ Switches

Question 3

Layer 3

Answer 3

Network

▪ Routers
▪ Multilayer switches
▪ IPv4 protocol
▪ IPv6 protocol
▪ Internet Control Message Protocol (ICMP)

Question 4

Layer 4

Answer 4

Transport

▪ TCP
▪ UDP
▪ WAN Accelerators
▪ Load Balancers
▪ Firewalls

Question 5

Layer 5

Answer 5

Session

▪ H.323
● Used to setup, maintain, and tear down a voice/video connection
▪ NetBIOS
● Used by computers to share files over a network

Question 6

Layer 6

Answer 6

Presentation

▪ HTML, XML, PHP, JavaScript, …
▪ ASCII, EBCDIC, UNICODE, …
▪ GIF, JPG, TIF, SVG, PNG, …
▪ MPG, MOV, …
▪ TLS, SSL, …

Question 7

Layer 7

Answer 7

Application

▪ E-mail (POP3, IMAP, SMTP)
▪ Web Browsing (HTTP, HTTPS)
▪ Domain Name Service (DNS)
▪ File Transfer Protocol (FTP, FTPS)
▪ Remote Access (TELNET, SSH)