Which service, command or tool discovers the IP addresses of all computers or routers between two computers on an internet/intranet network?
A.
Whois
B.
Port scanner
C.
Traceroute
D.
Nslookup
Explanation:
The traceroute command is used to determine the hops between two computers, and identify their IP addresses. One of the computers is the computer where the traceroute command is executed. Traceroute uses the ICMP command, and limits the maximum hop count, until either the destination is reached or a timeout occurs.
Incorrect Answers:
A: The WHOIS command is used to discover primary and secondary name servers.
B: The port scanner is used to determine the active ports on a node..
D: The NSLOOKUP command is used to test out entries in a name server. If you can successfully imitate a secondary name server with NSLOOKUP you can initiate a Zone transfer with a Master. With a zone transfer you can identify the IP address to Name mappings of all registered nodes. The reason why this is not the answer is that NSLOOKUP only discovers registered nodes, so if the node is not in DNS, or the mapping is wrong, or the node is obsolete but not deleted, you end up with a lot of missing and inaccurate information. Usually a router is not registered in DNS, so you 1D0-470
would not get most of the routers. Compared to either the ping scanner or port scanner, those scanners perform live polling commands against the network and identify live and operational nodes. Even if you discovered the nodes, you can’t generate a map to determine which of those nodes are in the path. TRACEROUTE will map the actual route, but NSLOOKUP will just tell you which nodes may be there, but it cannot give you the path, nor is the list accurate.