Which value is the Solaris default TTL?

• A. 64
• B. 255
• C. 128
• D. 32

Answer: (B)

The TTL in an IP packet is the initial hop limit that the sender assigns to the packet. Each router that forwards the packet decreases this value by one, and if it reaches zero the packet is discarded. Different operating systems pick different starting TTLs. Solaris uses 255 as its default initial TTL, which is a distinctive signature that helps identify the host type in network analysis. Among the options, 255 best matches Solaris’ default. The other values are more typical for other systems (64 or 128) or less common (32). Remember that observed TTLs on replies reflect how much of the initial value remains after traversing the network, not the starting value itself.