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

Question 5

In multinational Wi-Fi networks, what do frequency bands, transmit power levels, and channel usage exemplify?

Answer 5

Requlatory Impacts

Question 6

What does the DNS record type NS denote?

Answer 6

Nameserver

Question 7

Which DNS resource record maps one hostname to another hostname?

Answer 7

A canonical name (CNAME) resource record

Question 8

Which class of IP network addresses has a value of between 128 and 191 for the first octet?

This class is typically intended for…

Answer 8

Class B

medium-sized to large organizations, like universities or large businesses.