CTI-120 pratice questions

A rack's height is measured in rack units (Us). How tall is a single rack unit?

1.75 inches tall

Which of the following uses metal clips placed over plastic slots to connect individual copper wires? AnswerCorrect Answer: 110 block

110 block

You've recently installed a new Windows server. To ensure system time accuracy, you've loaded an application that synchronizes the hardware clock on the server with an external time source on the internet. Now you must configure your network firewall to allow time synchronization traffic through. Which of the following ports are you MOST LIKELY to open on the firewall?

123

Which port number is used by SNMP?

161

Which port does Telnet use?

23

You're configuring a network firewall to allow SMTP outbound email traffic and POP3 inbound email traffic. Which of the following TCP/IP ports should you open on the firewall? (Select two.)

25 Correct Answer: 110

Rack heights vary from a few rack units to many rack units. The most common rack heights are 24U and 42U. How tall is a 24U rack?

42 inches

Multi-mode fiber is designed to operate at which of the following wavelengths?

850 nm and 1300 nm

While viewing the status of interfaces on a Cisco switch, you see an abnormally large number of CRC errors on one interface. This interface is connected to a user's workstation that is located in a cubicle on the second floor. What could cause this to happen?

A strong EMI emitter near the cable connected to that interface.

Which of the following is a valid MAC address?

AB.07.CF.62.16.BD

A host wants to send a message to another host that has an IP address of 115.99.80.157, but it does not know the destination device's hardware address. Which protocol can be used to discover the MAC address?

ARP

During network transmission, data is transferred to various routers, which forward the data to the appropriate network. If the source and destination network addresses reside on the same network, which protocol is used to determine the destination IP's MAC address?

ARP

You need to replace a fiber optic cable that's connecting two switches together. You inspect the existing cable and determine that it uses LC connectors. You also notice that the cable's ferrule has a slight slant to it. Which polish grade should you use to replace the existing cable?

Angled Physical Contact polish

Match each networking function or device on the left with its associated OSI model layer on the right.

Application layer HTTP correct answer: Presentation layer Translates data correct answer: Session layer Session ID number correct answer: Transport layer incorrect answer: Switch correct answer: Port number Network layer Router correct answer: Data Link layer incorrect answer: Port number correct answer: Switch Physical layer Modem

You're working with an older 10Base2 Ethernet network. Which of the following connector types will you MOST LIKELY encounter?

BNC

Match each TCP/IP layers with its function.

Breaks the data into pieces. incorrect answer: Application correct answer: Transport Prepares the data to be sent. incorrect answer: Transport correct answer: Application Adds physical addresses. Link correct answer: Adds logical addresses. Internet

Which of the following topologies connects all devices to a trunk cable?

Bus

Which of the following is a valid MAC address?

C0-34-FF-15-01-8E

You are making Ethernet drop cables using Cat5e cables and RJ45 connectors. You need to remove the plastic coating over the cable to expose the individual wires. Which tool should you use?

Cable stripper

Which of the following cable types often includes a solid plastic core that keeps the twisted pairs separated? Answer Cat 3 Cat 5 Cat 5e Correct Answer: Cat 6

Cat 6

What is the purpose of a frame check sequence (FCS) footer?

Checksum error detection

You've implemented a network where hosts are assigned specific roles, such as file sharing and printing roles. Other hosts access those resources, but they don't host services of their own. Which type of network do you have?

Client-server

Which of the following tasks is associated with the Session layer?

Connection establishment

What is the basic purpose of the OSI Physical layer?

Coordinate rules for sending and receiving electrical signals.

You've decided to implement Gigabit Ethernet on your network; each switch port is connected to a single device. Following the installation, you find one device connected to a switch that's only running at 100 Mbps. Which of the following is MOST LIKELY the cause?

Crosstalk

In the OSI model, which of the following functions are performed at the Presentation layer? (Select two.)

Data encryption and compression Data format specifications

Which of the following are included as part of the Data Link layer specifications? (Select two.)

Data transmission between hosts Physical network device identification

Which of the following describes the point where the service provider's responsibility to install and maintain wiring and equipment ends and the customer's begins?

Demarc

You have a cable internet connection at home. The installer had connected the router near the outside wall of your house with RG6 cable. You move the cable router a distance of 50 meters using RG8 cables and special connector adapters. Which condition are you MOST LIKELY to experience?

Echo

In the OSI model, which of the following functions are performed at the Application layer? (Select two.)

Enabling of communication between network clients and services. Integration of network functionality into the host operating system.

Which of the following is the process of breaking a message into packets, adding controls and other information, and then transmitting the message through the transmission medium?

Encapsulation

You've just signed up for a broadband home internet service that uses coaxial cabling. Which connector type will you MOST LIKELY use?

F-type

You are the network administrator for a small organization. Recently, you contracted with an ISP to connect your organization's network to the internet. Since doing so, it has come to your attention that an intruder has invaded your network from the internet on three separate occasions. Which type of network hardware should you implement to prevent this from happening again?

Firewall

Which of the following creates a visual representation of physical components along with a clearly defined set of principles and procedures?

Floor plan

Which of the following are advantages of using fiber optic cabling for a network? (Select two.)

Greater cable distances without a repeater Immunity to electromagnetic interference

Routing data between computers on a network requires several mappings between different addresses. Which of the following statements is true? Answer ICMP lets routers bypass the general network broadcast by providing a dynamic table of IP-to-MAC address mappings. Correct Answer: Hosts use ARP to resolve known IP addresses into MAC addresses. Incorrect answer: Routers use DNS to resolve MAC addresses of diskless workstations into IP addresses based on the information contained in other routers' routing tables. Diskless workstations use ARP to ask a server for an IP address.

Hosts use ARP to resolve known IP addresses into MAC addresses.

Which of the following protocols allows hosts to exchange messages to indicate problems with packet delivery?

ICMP

Which of the following BEST describes how a switch functions?

It connects multiple cable segments (or devices) and forwards frames to the appropriate segment.

Which of the following statements accurately describe how a modem works? (Select two.)

It demodulates analog data from a telephone network into digital PC data. It modulates digital data from a PC into analog data and transmits it on a telephone network.

Which of the following are characteristics of a coaxial network cable? (Select two.)

It has a conductor made from copper in its center. It uses two concentric metallic conductors.

Which of the following are true about a MAC address? (Select two.)

It is a 48-bit address. Correct Answer: It is typically represented by hexadecimal numbers.

Which of the following is true about single-mode fiber optic network cabling?

Its central core is smaller than the standard multi-mode fiber optic cabling core.

Which recommendation should you follow while using 110 blocks for connecting Cat5 and higher data cables?

Keep wire pairs twisted up to within one half of an inch of the connector.

Which of the following connectors are used with fiber optic cables and include both cables in a single connector? (Select two.)

LC Correct Answer: MTRJ

At which OSI model layer does a media converter operate?

Layer 1

Workstation3 has started communicating with Workstation2. It sends a frame to the default gateway. Identify the Layer 2 and Layer 3 addresses used by the Cisco 2600 router to forward the data to Workstation2 by dragging the corresponding address from the list on the left to its location on the right.

Layer 2 source address 000b5f2a2222 correct answer: Layer 3 source address 192.168.11.11 correct answer: Layer 2 destination address 080046987654 correct answer: Layer 3 destination address 192.168.10.12

Workstation2 needs to send data to Workstation3. Identify the Layer 2 and Layer 3 addresses Workstation2 will use to send the data by dragging the corresponding address from the list on the left to its location on the right.

Layer 2 source address incorrect answer: 080046982365 correct answer: 080046987654 Layer 3 source address incorrect answer: 192.168.10.2 correct answer: 192.168.10.12 Layer 2 destination address incorrect answer: 000b5f2a2223 correct answer: 000b5f2a2222 Layer 3 destination address incorrect answer: 192.168.11.1 correct answer: 192.168.11.11

Which of the following features does UDP provide? (Select two.)

Low overhead Correct Answer: Connectionless datagram services

Which of the following terms identifies the wiring closet in the basement or ground floor that typically includes the demarcation point?

MDF

You have a server that has a 100BaseFX network interface card you need to connect to a switch. The switch only has 100BaseTX switch ports. Which device should you use?

Media converter

Your manager has asked you to implement a network infrastructure that will accommodate failed connections. Which of the following network topologies provides redundancy for a failed link?

Mesh

You have a network that uses a logical bus topology. How do messages travel through the network?

Messages are broadcast to all devices connected to the network.

You have a network that uses a logical ring topology. How do messages travel through the network?

Messages travel from one device to the next until they reach the destination device.

Which of the following geographic network types is typically managed by a city as a public utility?

Metropolitan area network (MAN)

You want to measure the voltage, amps, and ohms of various devices. Which tool should you use?

Multimeter

You have a large TCP/IP network and want to keep a host's real-time clock synchronized. Which protocol should you use?

NTP

At which OSI layer does a router operate to forward network messages?

Network

Which network component connects a device to transmission media and allows the device to send and receive messages?

Network interface card

You're installing network wiring for a new Ethernet network at your company's main office building. The project specifications call for Cat 5e UTP network cabling and RJ45 wall jacks. Near the end of the project, you run out of wire before the last few runs are complete. You have a spool of Cat 3 network cable in storage. Upon closer inspection, it appears very similar to the Cat 5e wiring. To finish the project, should you use the Cat 3 cabling as a substitute for the Cat 5e cabling?

No. Cat 5e cabling has more twists per inch than Cat 3 cabling, reducing crosstalk and supporting higher data rates.

You're building a new network for a small financial services startup company. Security is paramount, so each organization within the company will have their own network segments separated by routers. Funds are limited, and you've been asked to keep costs to a minimum. You've acquired a used fiber optic switch, and you want to use it to create a fiber optic backbone that interconnects all of the routers. You've purchased several used multi-mode GBIC modules on eBay that you'll install on each router to allow them to connect to the switch. Both the switch and the GBIC modules use MTRJ connectors. You've purchased several used 1-meter, multi-mode patch cables from Amazon. But when they arrived, you noticed that they use LC connectors. Fortunately, with some force, you found that you're able to get the LC connectors on the cables to lock into the MTRJ connectors on the GBIC modules and on the switch. Will this implementa

No. You should purchase patch cables that use MTRJ connectors.

You're building a new network for a small financial services startup company. Security is paramount, so each organization within the company will have its own network segment separated by a router. However, funds are limited, and you've been asked to keep costs to a minimum. You've acquired a used fiber optic switch, and you want to use it to create a fiber optic backbone that interconnects all of the routers. You've purchased several used single-mode GBIC modules on eBay that you'll install on each router to allow them to connect to the switch. Both the switch and the GBIC modules use MTRJ connectors. You connect each module to the switch with 1-meter multimode patch cables. Will this implementation work?

No. You shouldn't use multi-mode patch cables with single-mode GBIC modules.

You're working with an existing fiber optic installation in your building. You want to know the length of each cable that runs through the walls. Which tool should you use?

OTDR

Your manager has asked you to implement a wired network infrastructure that will accommodate failed connections. You don't have a large budget, so you decide to provide redundancy for only a handful of critical devices. Which of the following network topologies should you implement?

Partial mesh

Which of the following terminates individual wires from a 25-pair or 100-pair cable using female RJ45 ports?

Patch panel

You've implemented a network where each device provides all other devices on the network with access to shared files. Which type of network do you have?

Peer-to-peer

At which layer of the OSI model do hubs operate?

Physical

You need to terminate a Cat6 UTP cable with an RJ45 connector. Your organization's IT policy states that all cable connectors must be wired according to TIA568B standards. Drag the UTP wire on the left to the correct pin on the RJ45 connector on the right.

Pin 1 White with orange stripe correct answer: Pin 2 Solid orange correct answer: Pin 3 White with green stripe correct answer: Pin 4 Solid blue correct answer: Pin 5 White with blue stripe correct answer: Pin 6 Solid green correct answer: Pin 7 White with brown stripe correct answer: Pin 8 Solid brown

You're adding new wires in your building for some new offices. The building has a false ceiling that holds the lights and provides an air path for heating and air conditioning. You'd like to run your Ethernet cables in this area. Which type of cable must you use?

Plenum-rated cable

You are preparing to attach wires in a 110 block. You want to connect the wires and trim off the excess at the same time. Which of the following should you do? (Select two.)

Point the cut side of the tool towards the wire end. Correct Answer: Use a punch down tool with a notched blade.

Match each layer of the TCP/IP model on the left with the corresponding layer of the OSI model on the right. Each option on the left can be used more than once.

Presentation layer Application correct answer: Data Link layer Network correct answer: Application layer Application correct answer: Session layer Application correct answer: Network layer Internetwork correct answer: Transport layer Transport

Which term does the OSI model use that's different from the TCP/IP model in reference to the terms frame, packet, and segment?

Protocol data unit (PDU)

Which tool should you use to extend network services beyond the demarc?

Punch down tool

You have a small home network connected to the internet using an RG-6 cable. You need to move the router, but you can't find anymore RG-6 cabling. Which cable type could you use instead?

RG-59

Which of the following connectors is used with Ethernet 100BaseTX networks?

RJ45

Which of the following connector types would you most likely use to connect to a T1 WAN service?

RJ48c

Which of the following functions are performed by the OSI Transport layer? (Select three.)

Reliable message delivery End-to-end flow control Data segmentation and reassembly

Which of the following hardware devices regenerate a signal out of all connected ports without examining the frame or packet contents? (Select two.)

Repeater Hub

Which of the following topologies connects each device to a neighboring device?

Ring

In the OSI model, what is the primary function of the Network layer?

Route messages between networks.

Which of the following hardware devices links multiple networks and directs traffic between networks?

Router

You want a switch to have the ability to modify the media type the switch port supports. Which type of module might you use to make this possible? (Select two.)

SFP Correct Answer: GBIC

Your company has just acquired another company in the same city. You need to integrate the two email systems so that messages can be exchanged between email servers. Currently, each network uses an email package from a different vendor. Which TCP/IP protocol enables message exchange between systems?

SMTP

Which of the following connectors is used with fiber optic cables and requires that you use a twisting motion to connect it?

ST

Which of the following connectors usually require polishing as part of the assembly process? (Select two.)

ST Correct Answer: SC

TCP is a connection-oriented protocol that uses a three-way handshake to establish a connection to a system port. Computer 1 sends a SYN packet to Computer 2. Which packet does Computer 2 send back?

SYN/ACK

Which type of optical fiber is normally used to connect two buildings that are several kilometers apart?

Single-mode fiber

Which of the following cables offers the best protection against EMI?

Single-mode fiber optic

Users report that the internet is no longer accessible. You suspect that the line connecting your building to the internet isn't working properly. Which of the following allows the service provider to remotely test the local loop?

Smartjack

You have a small network that uses a switch to connect multiple devices. Which physical topology are you using?

Star

You're an application developer, and you're writing a program for exchanging video files through a TCP/IP network. You need to select a transport protocol that will guarantee delivery. Which TCP/IP protocol provides this capability?

TCP

Which of the following network services or protocols uses TCP/IP port 69?

TFTP

You've connected a cable certifier to an RJ45 wall jack, and the output shown below is displayed on the device. What does this output indicate? (Select two.)

The cable is functioning correctly. This is a crossover cable.

Which of the following are characteristics of an LC fiber optic connector? (Select two.)

They are half the size of standard connectors. They use a housing and latch system similar to an RJ45 UTP connector.

Which of the following are characteristics of an MTRJ fiber optic connector? (Select two.)

They can be used with multi-mode fiber optic cables. They use metal guide pins to ensure accurate alignment.

Which device sends signals from a computer onto a network? AnswerIncorrect answer: Router Gateway Cable Correct Answer: Transceiver

Transceiver

During TCP/IP communication between two network hosts, information is encapsulated on the sending host and decapsulated on the receiving host using the OSI model. Match the information format on the left with the appropriate layer of the OSI model on the right.

Transport layer Segments correct answer: Network layer Packets correct answer: Data Link layer Frames correct answer: Physical layer Bits

You have a network that occupies all three floors of a building. The WAN service provider has installed the line in a wiring closet on the main floor. You have a wiring closet on the two remaining floors directly above the wiring closet on the main floor. What would you use to connect the wiring closets together?

Vertical cross connect

How do switches and bridges learn where devices are located on a network?

When a frame enters a port, the source MAC address is copied from the frame header.

When does a router use ARP?

When the router's routing table doesn't contain the MAC addresses of devices on the local LAN that they need to forward frames to.

Why might you use an RJ11 connector? Answer You want to connect a 10GBaseT network to a switch card using a Cat 6 cable. Correct Answer: You want to connect your computer to the internet with a DSL modem. You want to upgrade your 10BaseT network to 100BaseTX. You want to connect your computer to a network using a Cat 7 cable.

You want to connect your computer to the internet with a DSL modem.