Network+

Question 1

What does the nmap command do using Terminals?

Answer 1

nmap is the command to execute the Network Mapping tool; a common and useful utility for discovering nodes on a network.

Question 2

Why isn’t a ping port displayed as open when examining a server?

Answer 2

Ping uses ICMP (internet control message protocol), which does not operate at the Transport layer (where port numbers exist).

Question 3

What type of device connects end systems within the same collision domain?
a) Switch
b) Hub
c) Router
d) Ethernet

Answer 3

Answer: B
A hub operates at Layer 1 (Physical Layer) of the OSI model.
- It simply repeats any signal it receives out of all its other ports.
- This means that all devices connected to a hub share the same collision domain. If two devices transmit at the same time, a collision occurs.

Question 4

What information is available in the MAC address table?

Answer 4

Layer 2 addresses