Copying IOS from flash to a laptop via TFTP (direct Ethernet connection): Your laptop is directly cabled to a router's Ethernet port to run 'copy flash tftp'. Which prerequisites must be met for the transfer to succeed?

Introduction / Context:
To copy an image from router flash to a TFTP server on a laptop, basic IP connectivity and a running TFTP service on the laptop are required. The router acts as a TFTP client during this operation.

Given Data / Assumptions:

• (1) TFTP server must run on the router – false.
• (2) TFTP server must run on the laptop – true.
• (3) The Ethernet cable must be straight-through – usually false for a direct old-style connection (crossover is traditional unless auto MDI-X is supported).
• (4) The laptop must be on the same IP subnet as the router’s Ethernet interface – true for a simple point-to-point link without routing.
• (5) The copy command must be supplied the laptop’s IP address – true; the router (client) needs the TFTP server address.

Concept / Approach:

Since the router is the TFTP client, the server process must exist on the laptop. With a direct cable and no routing, both interfaces should share a subnet. The command prompts for the remote host (TFTP server) IP, which is the laptop’s address.

Step-by-Step Solution:

Verification / Alternative check:

Ping the laptop from the router to verify connectivity. Ensure the TFTP server's working directory is writable. Observe file transfer progress and resulting file on the laptop.

Why Other Options Are Wrong:

(1) Router does not host the TFTP server for this operation.

(3) Cable type depends on hardware; a straight-through is not a universal requirement for a direct PC-to-router link (traditionally crossover).

Common Pitfalls:

Blocked by host firewall on UDP 69; wrong TFTP root path; using the wrong cable on non-auto-MDI-X ports; forgetting to set matching subnets.

Final Answer:

2, 4 and 5