COMPTIA Network+ Quiz 4

A network technician at a warehouse must implement a solution that will allow a company to track shipments as they enter and leave the facility. The warehouse workers must scan each package as it enters the warehouse using a sensor. Which of the following technologies should they utilize to meet these requirements?

• Wi-Fi

• RFID

• Bluetooth

• NFC

Answer explanation

Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. The warehouse could utilize RFID to allow for the accurate scanning of items using radio frequency tracking tags and sending data of up to 2 KB to a sensor at rapid speeds.

Which of the following devices operates at layer 2?

• Repeater

• Switch

• Router

• Firewall

Answer explanation

A basic switch operates at layer 2 of the OSI model. For the exam, unless they mention a "multilayer switch" or "layer 3 switch", always assume they are referencing a basic layer 2 switch. A router is a layer 3 device. A repeater is a layer 1 device. A firewall will operate layers 3 through 7, depending on the type of firewall.

Which of the following network protocols is used to send email from one server to another server?

• RDP

• SNMP

• POP3

• SMTP

Answer explanation

Simple Mail Transfer Protocol (SMTP) is a well-known application that uses port 25 for sending email from one server to another server.

Which type of cable uses an F-connector?

• MMF

• SMF

• Cat 5

• RG-6

Answer explanation

An F-type connector is a coaxial radiofrequency connector commonly used for cable television with an RG-6 cable. RG-6 is a type of coaxial cable used to transmit audio and video signals to devices such as television sets. It is also used with cable modems to transmit data.

Which of the following technologies allows two or more links to pass network traffic as if they were one physical link?

• STP

• PoE

• LACP

• SLAAC

Answer explanation

The Link Aggregation Control Protocol (LACP) enables you to assign multiple physical links to a logical interface that will appear as a single link to a route processor. LACP is used to combine multiple network connections in parallel to increase throughput beyond what a single connection could sustain and to provide redundancy in case one of the links should fail. LACP is defined in the IEEE 802.3ad standard.

Andy is a network technician who is preparing to configure a company's network. He has installed a firewall to segment his network into an internal network, a DMZ or screen subnet, and an external network. No hosts on the internal network should be directly accessible by their IP address from the Internet, but they should be able to reach remote networks if they have been assigned an IP address within the network. Which of the following IP addressing solutions would work for this particular network configuration?

• Toredo Tunneling

• Private

• APIPA

• Classes

Answer explanation

A private IP address is an IP address reserved for internal use behind a router or other Network Address Translation (NAT) devices, apart from the public. Private IP addresses provide an entirely separate set of addresses that still allow access to a network without taking up a public IP address space.

A network technician must allow HTTP traffic from the Internet over port 80 to an internal server running HTTP over port 81. Which of the following is this an example of?

• Dynamic DNS

• Static NAT

• Dynamic NAT

• Port Forwarding

Answer explanation

Port forwarding is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall. Port Address Translation (PAT) is a type of dynamic NAT which can map multiple private IP addresses to a single public IP address by using port forwarding. Since this question focused on the relationship between port 80 at the gateway or public IP address being mapped to port 81 on the internet server, this is an example of port forwarding.

Which protocol is used for the synchronization of clocks between different computer systems over a packet-switched, variable-latency data network?

• DNS

• NTP

• DHCP

• TFTP

Answer explanation

NTP is a networking protocol that is used for the synchronization of clocks between different computer systems that communicate over a packet-switched, variable-latency data network. TCP/IP networks are packet-switched networks, so NTP is used for the synchronization of time across IP-connected servers.

Which type of wireless network utilizes the 2.4 GHz or 5 GHz frequency bands and reaches speeds of 108 Mbps to 600 Mbps?

• 802.11a

• 802.11B

• 802.11g

• 802.11n

• 802.11ac

Answer explanation

The wireless 802.11n standard supports the use of either the 2.4 GHz or 5 GHz frequency band and can reach speeds of up to 108 Mbps to 600 Mbps. Wireless N (802.11n) is backward compatible with Wireless A, B, and G.

What type of services can allow you to get more storage and more resources added to the cloud as fast as possible?

• Metered switches

• Rapid elasticity

• Measured services

• Resource pooling

Answer explanation

Rapid elasticity allows users to automatically request additional space in the cloud or other types of services. Because of the setup of cloud computing services, provisioning can be seamless for the client or user. Providers still need to allocate and de-allocate resources that are often irrelevant on the client or user's side. This feature allows a service to be scaled up without purchasing, installing, and configure new hardware, unlike if you had to install more physical storage into a server or datacenter.