Computers N4

Question #78

Topic 1

A network technician needs to ensure outside users are unable to telnet into any of the servers at the datacenter. Which of the following ports should be blocked when checking firewall configuration?

• • A. 22

• • B. 23

• • C. 80

• • D. 3389

• • E. 8080

Answer explanation

• Telnet uses UDP port 23.

Question #79

Topic 1

A technician is writing documentation regarding a company's server farm. The technician needs to confirm the server name for all Linux servers. Which of the following commands should the technician run?

• • A. ipconfig

• • B. nslookup

• • C. arp

• • D. route

Answer explanation

• nslookup (name server lookup) is a tool used to perform DNS lookups in Linux. It is used to display DNS details, such as the IP address of a particular computer, the MX records for a domain, or the NS servers of a domain

Question #80

Topic 1

A technician is connecting multiple switches to create a large network for a new office. The switches are unmanaged Layer 2 switches with multiple connections between each pair. The network is experiencing an extreme amount of latency. Which of the following is MOST likely occurring?

• • A. Ethernet collisions

• • B. A DDoS attack

• • C. A broadcast storm

• • D. Routing loops

Answer explanation

• A broadcast storm is an abnormally high number of broadcast packets within a short period of time. They can overwhelm switches and endpoints as they struggle to keep up with processing the flood of packets. When this happens, network performance degrades.

Question #81

Topic 1

A store owner would like to have secure wireless access available for both business equipment and patron use. Which of the following features should be configured to allow different wireless access through the same equipment?

• • A. MIMO

• • B. TKIP

• • C. LTE

• • D. SSID

Answer explanation

• The feature that should be configured to allow different wireless access through the same equipment is SSID (Service Set Identifier). SSID is a unique identifier that allows wireless devices to connect to a wireless network. By configuring multiple SSIDs, the store owner can provide separate wireless access for business equipment and patron use, while using the same wireless access points

Question #82

Topic 1

Which of the following systems would MOST likely be found in a screened subnet?

• • A. RADIUS

• • B. FTP

• • C. SQL

• • D. LDAP

Answer explanation

• A screened subnet, also known as a DMZ (Demilitarized Zone), is a network segment that sits between an organization's internal network and an external network, such as the internet. The purpose of a screened subnet is to host services that need to be accessible from both the internal network and the external network while providing an additional layer of security.

• Among the options provided, the system that would MOST likely be found in a screened subnet is:

• B. FTP (File Transfer Protocol)

• FTP servers are often placed in a DMZ to allow external users to access files while segregating them from the internal network. This arrangement helps mitigate security risks associated with exposing file-sharing services to external users. Therefore, FTP is the most likely system to be found in a screened subnet.

Question #83

Topic 1

Which of the following would need to be configured to ensure a device with a specific MAC address is always assigned the same IP address from DHCP?

• • A. Scope options

• • B. Reservation

• • C. Dynamic assignment

• • D. Exclusion

• • E. Static assignment

Answer explanation

• DHCP reservations allow the DHCP server to pre-set an IP address to a specific client based on its MAC address. This ensures that the client will always get the same IP address from the DHCP server when it connects to the network. DHCP reservations are usually used with servers or printers on your internal network and are rarely used with end-user devices.

Question #84

Topic 1

Access to a datacenter should be individually recorded by a card reader even when multiple employees enter the facility at the same time. Which of the following allows the enforcement of this policy?

• • A. Motion detection

• • B. Access control vestibules

• • C. Smart lockers

• • D. Cameras

Answer explanation

• Access control vestibules can ensure that each individual's entry into the datacenter is separately recorded by a card reader, even when multiple employees enter the facility at the same time. Access control vestibules are small rooms with two doors that require authorized individuals to present their access cards to enter or exit. The vestibules ensure that only authorized individuals enter the datacenter, and their entry is individually recorded by the card reader. Once the first door is closed, the employee must present their card again to enter the second door. This double-entry system ensures that access to the datacenter is controlled and recorded accurately.

Question #85

Topic 1

A workstation is configured with the following network details:

Software on the workstation needs to send a query to the local subnet broadcast address. To which of the following addresses should the software be configured to send the query?

• • A. 10.1.2.0

• • B. 10.1.2.1

• • C. 10.1.2.23

• • D. 10.1.2.255

• • E. 10.1.2.31

Answer explanation

• CIDR 27 is 1111 1111.1111 1111.1111 1111.1110 0000

• 2^5 = 32 hosts per subnet

• 1st address is network address, last address is broadcast address

• The user address is 10.1.2.23 which means he reside in the network of 10.1.2.0 to 10.1.2.31

• 10.1.2.31 is the last address in that network thus the broadcast address

Question #86

Topic 1

After the A record of a public website was updated, some visitors were unable to access the website. Which of the following should be adjusted to address the issue?

• • A. TTL

• • B. MX

• • C. TXT

• • D. SOA

Answer explanation

• TTL (Time to Live) should be adjusted to address the issue. The TTL determines the amount of time a record remains cached on a DNS server before it is considered expired and must be retrieved again. If the TTL is set too low, it can result in visitors being unable to access the website because they are accessing a cached, outdated version of the DNS record.

Question #88

Topic 1

A technician is installing multiple UPS units in a major retail store. The technician is required to keep track of all changes to new and old equipment. Which of the following will allow the technician to record these changes?

• • A. Asset tags

• • B. A smart locker

• • C. An access control vestibule

• • D. A camera

Answer explanation

• Asset tags keep track of the equipment for sure. I was looking for a change log or something but that's not an option.