Netstat is a useful tool for checking network and Internet connections. Some useful applications for the average PC user are considered, including checking for malware connections. a. Open the command prompt window and: netstat –an ESTABLISHED indicates that the server received the SYN signal from the client and the session is established. How many connections are ESTABLISHED? b. To find out which programs are making connections with the outside world, we can use the command netstat –b. netstat –b List two programs that have made connections to the outside world. c. To view the routing table on the current machine, use netstat –r netstat –r What is the IP address of the Gateway? d. How many entries are in the routing table in c? e. To display the statistics for only the TCP protocol, type the following command: netstat –sp tcp How many TCP segments were retransmitted? f. Based on e, how many current TCP connections are there?

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Netstat is a useful tool for checking network and Internet connections.
Some useful applications for the average PC user are considered,
including checking for malware connections.

a. Open the command prompt window and:
netstat –an
ESTABLISHED indicates that the server received the SYN signal from the
client and the session is established.
How many connections are ESTABLISHED?

b. To find out which programs are making connections with the outside world,
we can use the command netstat –b.
netstat –b
List two programs that have made connections to the outside world.

c. To view the routing table on the current machine, use netstat –r
netstat –r
What is the IP address of the Gateway?

d. How many entries are in the routing table in c?

e. To display the statistics for only the TCP protocol, type the following
command:
netstat –sp tcp
How many TCP segments were retransmitted?

f. Based on e, how many current TCP connections are there?

 

 

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