Free Microsoft Networking Essentials: Final Course Question and Answers

Question 1

What happens when a tiny wireless router's security mode is set to WEP?

Accepted Answer

It encrypts data between the wireless client and the access point.

Answer

Explanation:
Data between the wireless client and the access point is encrypted using WEP. IP addresses are converted into simple-to-remember domain names by DNS. An internal address or set of addresses is converted into an external, public address through NAT. The access point can alert clients to its presence using an SSID.

Question 2

Which solution permits only internal FTP servers on private networks to be accessed by external users?

Accepted Answer

port forwarding

Answer

Explanation:
By using port forwarding, it is possible for other users to access devices connected to a private network over the Internet. Based on the port number, the firewall in the router decides if the traffic needs to be forwarded to an internal device. Port numbers are connected to particular services, including FTP, HTTP, HTTPS, and POP3.

Question 3

What is an SSID broadcasting security flaw that is inherently present?

Accepted Answer

It broadcasts the identity of the network.

Answer

Explanation:
Because an attacker can simply intercept wireless signals and read plain text messages, wireless routers, and access points by default broadcast SSIDs in plain text to all PCs within the wireless range.

Question 4

The hosts on a network are given IP addresses on a dynamic basis by a DHCP server. The configuration for the address pool is 192.168.10.0/24. On this network, three printers require the use of reserved static IP addresses from the pool. How many IP addresses in the pool are still available for other hosts to be assigned?

Accepted Answer

251

Answer

A /24 subnet provides 256 total IP addresses, but the network address (192.168.10.0) and broadcast address (192.168.10.255) are reserved, leaving 254 usable addresses for hosts. Since three printers require static IP addresses from this usable pool, these three addresses are no longer available for dynamic assignment. Therefore, 254 minus 3 equals 251 addresses remaining available for other hosts.

Question 5

To communicate over the network, a client device on an Ethernet segment requires an IP address. On the network, a DHCP server with the IP address 192.168.1.1 has been set up and activated. How can a client device get an IP address that works on this network?

Accepted Answer

Answer

When a client device needs an IP address from a DHCP server, it initiates the process by sending a DHCPDISCOVER message. This message is broadcast at both the MAC layer (using FF-FF-FF-FF-FF-FF) and the IP layer (using 255.255.255.255) to ensure that any DHCP server on the local network segment receives it. This broadcast allows the client to find a DHCP server without knowing its specific IP address beforehand.

Microsoft Networking Essentials Exam Practice Test

Microsoft Networking Essentials Exam Practice Test

Free Microsoft Networking Essentials: Final Course Question and Answers