OSI Model Quiz

1. Which OSI layer provides end-to-end transport functions associated with TCP, including sequencing and reliability?

2. In the OSI model, an HTTP request generated by a web browser belongs primarily to which layer?

3. Two systems use different character encodings, so transmitted data must be translated into a mutually understandable format. Which OSI layer is responsible in the model?

4. A workstation discovers that a destination is on another IP network and sends the traffic toward its default gateway. Which OSI layer is chiefly involved in this decision?

5. What is the conventional name for the protocol data unit at the Data Link layer?

6. A damaged connector weakens the electrical signal traveling through a copper cable. At which OSI layer is the fault occurring?

7. When TCP application data is encapsulated for transmission over Ethernet, which sequence best represents its progression toward the physical medium?

8. A firewall rule allows or blocks traffic according to destination TCP port 443. Which OSI layer supplies the port information used by the rule?

9. A packet capture shows that Ethernet frames are being rejected because their frame check sequence indicates corruption. Which layer detects this problem?

10. A long-running communication uses checkpoints so it can resume from a known point after an interruption. Which OSI layer is most closely associated with this function?

11. Which sequence lists the OSI layers correctly from Layer 7 down to Layer 1?

12. While forwarding an IPv4 packet, a router examines the destination IP address and decrements the packet's TTL value. Which OSI layer describes these operations?

13. A protocol analyzer displays TCP sequence numbers and source and destination ports. Which OSI layer's information is being examined?

14. A basic Ethernet hub receives incoming signals and repeats them out its other ports without examining frames or addresses. At which OSI layer does it operate?

15. An Ethernet switch reads destination MAC addresses to choose the port through which it forwards a frame. At which layer is it operating for this task?

16. A user can reach a server by IP address, but a DNS name for that server does not resolve. Which OSI layer is the best starting point for investigating the DNS service?