N10-009 Question #277: Real Exam Question with Answer & Explanation

Question

Which of the following is the most likely function to be decremented when a tool is used to measure the distance between two locations on the internet?

Options

• AGRE
• BTTL
• CVPN
• DQoS

Explanation

When using a tool like traceroute to measure the distance between two internet locations, the Time-To-Live (TTL) field in an IP packet is decremented at each hop.

Common mistakes.

• A. GRE (Generic Routing Encapsulation) is a tunneling protocol, not a field decremented to measure hop count.
• C. VPN (Virtual Private Network) provides secure, private network connections over a public network, but it's not a field that is decremented for distance measurement.
• D. QoS (Quality of Service) refers to mechanisms for managing network traffic and prioritizing bandwidth, not a field that decreases with each hop.

Concept tested. Traceroute and TTL function

Reference. https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/description-of-traceroute-command

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