COMPTIA Network+ Quiz 3

A network administrator was told by the Chief Information Officer (CIO) to set up a new office with a network that has full redundancy. What topology would BEST meet the CIO's requirement?

• Hybrid

• Bus

• Mesh

• Star

Answer explanation

A mesh topology connects every endpoint to every other endpoint, creating a fully redundant network.

According to the OSI model, at which of the following layers is data encapsulated into a frame?

• Layer 1

• Layer 2

• Layer 3

• Layer 4

Answer explanation

The data layer, or layer 2, is the second layer of the seven-layer OSI model. The data link layer encapsulates data into frames for delivery between nodes on the same network. Data is transmitted at Layers 5, 6, and 7 of the OSI model. At Layer 4, the data is encapsulated into segments. At layer 3, the segments are encapsulated into packets. At layer 2, the packets are encapsulated into frames. At layer 1, the frames are encapsulated into bits.

David noticed that port 3389 was open on one of the POS terminals in a store during a scheduled PCI compliance scan. Based on the scan results, what service should he expect to find enabled on this terminal?

• MySQL

• RDP

• LDAP

• IMAP

Answer explanation

Port 3389 is an RDP port used for the Remote Desktop Protocol. If this port isn’t supposed to be opened, then an incident response plan should be the next step since this can be used for remote access by an attacker.

Which of the following cable types are used for very short-range high-speed applications, such as in SATA 3.0 cables and uplinks between two switches in the same rack-mounted enclosure?

• Coaxial

• Fiber optic

• Twisted pair

• Twinaxial

Answer explanation

Twinaxial cabling, or "Twinax", is a type of cable similar to coaxial cable, but with two inner conductors instead of one. Due to cost efficiency, it is commonly used in very short-range high-speed differential signaling applications, such as SATA 3.0 cables and uplinks between SFP+ modules in switches or routers.

You have been asked by your supervisor, Tamera, to ensure that you enable 802.3af on a managed switch. Which of the following features does she want you to enable?

• PoE

• Port Bonding

• VLAN

• Trunking

Answer explanation

The IEEE 802.3af standard defines power over Ethernet (PoE) and supports 15.4W of DC power to each device. The IEEE 802.3at standard defines PoE+ and supports 25.5W of DC power to each device. Power over Ethernet or PoE technology describes a system to safely transfer electrical power, along with data, to remote devices over standard data cables in an Ethernet network.

IPv4 addresses are written using Base 10 numbers, while IPv6 addresses are written in Base 16 numbers. What type of notation does Base16 utilize?

• Octect

• Binary

• Hexadecimal

• Decimal

Answer explanation

Hexadecimal (or Hex for short) is the system of numbering that uses Base16. This includes the numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F.

You have been asked to configure a router. Which of the following protocols should you enable to allow the router to determine the path to another network?

• BGP

• RTP

• NTP

• STP

Answer explanation

BGP (Border Gateway Protocol) is a protocol that operates at layer 3 of the OSI model. Since the question asks about a router, you need to identify a routing protocol that would enable the router to determine the path to another network using IP (layer 3) information.

Which of the following is a DNS record type?

• TTL

• DHCP

• PTR

• LDAP

Answer explanation

There are several types of DNS records, including A, AAAA, CNAME, PTR, SVR, and TXT. PTR records are used for the Reverse DNS (Domain Name System) lookup. Using the IP address, you can get the associated domain/hostname. An A record should exist for every PTR record.

Which type of wireless network utilizes the 5 GHz frequency band and reaches speeds of up to 54 Mbps?

• 802.11a

• 802.11b

• 802.11g

• 802.11n

Answer explanation

The wireless 802.11a standard uses the 5 GHz frequency band and can reach speeds of up to 54 Mbps. Unfortunately, when this was first released, the radios to operate with this standard were fairly expensive, so it did not sell well or become widespread.

Which of the following technologies allows an administrator to create virtual machines by abstracting the operating system and applications from the underlying hardware?

• vNIC

• FCoE

• Hypervisor

• vSwitch

Answer explanation

A hypervisor is hardware, software, or firmware capable of creating virtual machines and then managing and allocating resources to them. A hypervisor is a function that abstracts the operating system and applications from the underlying computer hardware.