CompTIA Network+ Question B-91

A company has a network with three switches, each one with eight ports. The switch is connected to a router that has a hub with four computers plugged into one of its interfaces. How many broadcast domains are present in this company’s network

A. 1
B. 2
C. 5
D. 16
E. 28

Correct Answer: B

CompTIA Network+ Question B-89

A network technician is considering opening ports on the firewall for an upcoming VoIP PBX implementation. Which of the following protocols is the technician MOST likely to consider? (Choose three.)

A. SIP
B. NTP
C. H.323
D. SMB
E. ICMP
F. RTP
G. IPSec
H. RDP

Correct Answer: ACF

CompTIA Network+ Question B-88

Which of the following can be issued from the command line to find the layer 3 hops to a remote destination?

A. traceroute
B. nslookup
C. ping
D. netstat

Correct Answer: A

CompTIA Network+ Question B-86

A network technician is performing a tracert command to troubleshoot a website-related issue. The following output is received for each hop in the tracert:
1 * * * Request timed out.
2 * * * Request timed out.
3 * * * Request timed out.
The technician would like to see the results of the tracert command. Which of the following will allow the technician to perform tracert on external sites but not allow outsiders to discover information from inside the network?

A. Enable split horizon to allow internal tracert commands to pass through the firewall
B. Enable IGMP messages out and block IGMP messages into the network
C. Configure the firewall to allow echo reply in and echo request out of the network
D. Install a backdoor to access the router to allow tracert messages to pass through

Correct Answer: C

Explanation:
Tracert makes use of ICMP echo packets to trace the route between two hosts. For the command to be successful, the firewall has to allow incoming echo replies and outgoing echo requests.

CompTIA Network+ Question B-85

A network technician has just installed a TFTP server on the administrative segment of the network to store router and switch configurations. After a transfer attempt to the server is made, the process errors out. Which of the following is a cause of the error?

A. Only FTP can be used to copy configurations from switches
B. Anonymous users were not used to log into the TFTP server
C. An incorrect password was used and the account is now locked
D. Port 69 is blocked on a router between the network segments

Correct Answer: D

Explanation:
The question states that the TFTP server is installed on the “administrative segment of the network”. This implies that the network has multiple segments (subnets) and TFTP server is on a different network segment to other computers.
For a computer on one subnet to connect to a computer on a different subnet, a router is required to route traffic between the two subnets. Routers often include firewalls so they can be configured to allow specific traffic to be routed between the subnets and block unwanted traffic.
TFTP uses UDP port 69. The most likely cause of the connection timeout error in the question is that the firewall has not been configured to allow traffic using UDP port 69.

CompTIA Network+ Question B-84

A technician who is working with a junior member of the team is called away for another issue. The junior technician orders an SC 80/125 fiber cable instead of an ST 80/125. Which of the following will MOST likely be an issue with the new cable?

A. Wavelength mismatch
B. Distance limitations
C. Connector mismatch
D. Attenuation/Db loss:

Correct Answer: C

CompTIA Network+ Question B-83

Exploiting a weakness in a user’s wireless headset to compromise the mobile device is known as which of the following?

A. Multiplexing
B. Zero-day attack
C. Smurfing
D. Bluejacking

Correct Answer: D

CompTIA Network+ Question B-82

A company has implemented the capability to send all log files to a central location by utilizing an encrypted channel. The log files are sent to this location in order to be reviewed. A recent exploit has caused the company’s encryption to become unsecure. Which of the following would be required to resolve the exploit?

A. Utilize a FTP service
B. Install recommended updates
C. Send all log files through SMTP
D. Configure the firewall to block port 22

Correct Answer: B

Explanation:
If the encryption is unsecure then we must look for encryption software updates or patches. If they are available we must install them.
As vulnerabilities are discovered, the vendors of the operating systems or applications often respond by releasing a patch. A patch is designed to correct a known bug or fix a known vulnerability in a piece of software.
A patch differs from an update, which, in addition to fixing a known bug or vulnerability, adds one or more features to the software being updated.