section 3 practice questions
Which of the following uses metal clips placed over plastic slots to connect individual copper wires? 25 pair 110 block 66 block 100 pair
110 block
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. Collisions between two or more network hosts. Two hosts on the network with the same MAC address. An incorrect subnet mask configured on the workstation.
A strong EMI emitter near the cable connected to that interface. The most likely cause is EMI or crosstalk on the UTP cabling, which can corrupt frames transmitted on the wire and cause a CRC error. On a hub-based Ethernet network, these errors are usually caused by collisions. However, because a switch is being used in this scenario, collisions can't occur. CRC errors are almost always Layer 1 errors.
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? Ultra Physical Contact polish Angled Physical Contact polish Flat Physical Contact polish Physical Contact polish
Angled Physical Contact polish A slight slant to the fiber ferrule indicates an Angled Physical Contact (APC) polish. Using a non-angled connector will cause excessive insertion loss.
You're working with an older 10Base2 Ethernet network. Which of the following connector types will you MOST LIKELY encounter? ST BNC F-type RJ11
BNC
Which of the following is a valid MAC address? 73-99-12-61-15 83-5A-5B-0B-31-55-F1 C0-34-FF-15-01-8E 34-9A-86-1G-B3-24
C0-34-FF-15-01-8E Note that one of the answers would be a valid MAC address except it uses a G value, which is beyond the hexadecimal range.
Which of the following cable types often includes a solid plastic core that keeps the twisted pairs separated? Cat 5e Cat 6 Cat 3 Cat 5
Cat 6
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? Collisions Impedance Crosstalk A short
Crosstalk A short is when the signal is received on an incorrect wire. A short typically means the cable doesn't work at all or communications are very limited and extremely slow. Collisions are eliminated when you connect a single device to each switch port. Impedance is mostly a factor in coaxial cables used for networking. Be sure to choose cables with the correct rating (50 or 75 ohm) based on the network type. Never mix cables that have different ratings.
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? FEXT EMI Echo NEXT
Echo An impedance mismatch (manifested by echo) occurs when you connect cables and devices that have a different impedance (resistance) rating. RG6 cables have a rating of 75 ohms, while RG8 cables have a rating of 50 ohms.
You've just signed up for a broadband home internet service that uses coaxial cabling. Which connector type will you MOST LIKELY use? RJ45 F-type RJ11 BNC
F-type
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? MAC ARP GBIC QSFP SFP
GBIC SFP new devices, such as switches and routers, use transceiver modules that allow you to modify a port's media type by changing the transceiver. There are several types of transceiver modules. A GBIC (gigabit interface converter) is a large transceiver that fits in a port slot. GBICs are used for Gigabit media, including copper and fiber optic. An SFP (small form-factor pluggable) is similar to a GBIC but is smaller in size. An SFP is sometimes called a mini-GBIC. An XFP transceiver is similar in size to an SFP, but it's used for 10-gigabit networking.
Which of the following is true about single-mode fiber optic network cabling? It has shorter segment lengths than multi-mode fiber optic cabling. It's optimized for 850 nm and 1300 nm light sources. Its central core is smaller than the standard multi-mode fiber optic cabling core. It's less expensive than multi-mode fiber optic 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? Use C-5 connectors. Connect wires using the T568B standard. Connect wires using the T568A standard. Keep wire pairs twisted up to within one half of an inch of the connector.
Keep wire pairs twisted up to within one half of an inch of the connector.
At which OSI model layer does a media converter operate? Layer 1 Layer 2 Layer 3 Layer 4
Layer 1 A media converter operates at Layer 1 of the OSI model, which is the Physical layer. The media converter translates frames into bits and transmits them on the transmission medium. At Layer 2, the MAC address is added to make the data into a frame. At Layer 3, the IP address is added to the packet. At Layer 4, the port and socket number are assigned.
At which OSI layer does a router operate to forward network messages? Transport Network Physical Data Link
Network A router uses the logical network address specified at the Network layer to forward messages to the appropriate LAN segment.
Which network component connects a device to transmission media and allows the device to send and receive messages? Client Network interface card Protocol Server
Network interface card (NIC)
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 uses a thicker copper wire than Cat 3 cabling, enabling higher data transmission rates. Yes. You can use Cat 3 cabling as a substitute for Cat 5e cabling since they're electrically identical. No. The sheath surrounding Cat 5e cabling is much thicker than the Cat 3 sheath, creating an extra layer of shielding that reduces crosstalk and supports higher data rates. No. Cat 5e cabling has more twists per inch than Cat 3 cabling, reducing crosstalk and supporting higher data rates.
No. Cat 5e cabling has more twists per inch than Cat 3 cabling, reducing crosstalk and supporting higher data rates.
Which of the following terminates individual wires from a 25-pair or 100-pair cable using female RJ45 ports? Horizontal cross connect 110 block Patch panel 66 block
Patch panel
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? STP cables Plenum-rated cable Cat 5e or Cat 6a cables Fiber optic cables
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 toward the connected end of the wire. Use a punch down tool with a straight blade. Point the cut side of the tool towards the wire end. Use the end without a cutting blade. Use a punch down tool with a notched blade.
Point the cut side of the tool towards the wire end. Use a punch down tool with a notched blade.
Which tool should you use to extend network services beyond the demarc? Crimper Punch down tool Tone generator Patch panel
Punch down tool
Which of the following connectors is used with Ethernet 100BaseTX networks? GG45 BNC ST RJ45
RJ45
Which of the following connector types would you most likely use to connect to a T1 WAN service? GG45 RJ48c RJ45 RJ11
RJ48c
Which of the following hardware devices links multiple networks and directs traffic between networks? Repeater Router Hub Bridge
Router
Which of the following connectors usually require polishing as part of the assembly process? (Select two.) BNC F-type SC ST RJ45
SC ST
Which of the following connectors is used with fiber optic cables and requires that you use a twisting motion to connect it? ST F-type BNC SC
ST
Which type of optical fiber is normally used to connect two buildings that are several kilometers apart? Single-mode fiber Shielded twisted pair Coaxial cable Multi-mode fiber
Single-mode fiber
Which of the following cables offers the best protection against EMI? Cat 5e Single-mode fiber optic Cat 5 RG-6
Single-mode fiber optic
Which of the following are characteristics of an MTRJ fiber optic connector? (Select two.) They use metal guide pins to ensure accurate alignment. They're called push-in-and-twist connectors. They use a keyed bayonet. They must never be used with single-mode fiber optic cables. They can be used with multi-mode fiber optic cables.
They use metal guide pins to ensure accurate alignment. They can be used with multi-mode fiber optic cables.
Which device sends signals from a computer onto a network? Transceiver Router Cable Gateway
Transceiver
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 Smart jack Horizontal cross connect Demarc extension
Vertical cross connect
How do switches and bridges learn where devices are located on a network? When a frame enters a port, the destination MAC address is copied from frame header. When a frame enters a port, the source IP address is copied from the frame header. When a frame enters a port, the source MAC address is copied from the frame header. When a frame enters a port, the destination IP address is copied from the frame header.
When a frame enters a port, the source MAC address is copied from the frame header.
Why might you use an RJ11 connector? You want to connect a 10GBaseT network to a switch card using a Cat 6 cable. 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.
A rack's height is measured in rack units (Us). How tall is a single rack unit? 1.25 inches tall 1.5 inches tall 1.75 inches tall 2 inches tall
1.75 inches tall
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? 36 inches 48 inches 30 inches 42 inches
42 inches A single rack unit (1U) is 1.75 inches tall and represents one slot in the rack.
Multi-mode fiber is designed to operate at which of the following wavelengths? 850 nm and 1310 nm 850 nm and 1300 nm 1310 nm and 1550 nm 1300 nm and 1550 nm
850 nm and 1300 nm
Which of the following is a valid MAC address? 95ABC2F4.ABC5.569D.43BF 145.65.254.10 FABC.875E.9BG6 AB.07.CF.62.16.BD
AB.07.CF.62.16.BD MAC addresses are comprised of 12 hexadecimal digits (ranging from 0-9 and A-F). They're typically represented as three sets of four hexadecimal digits or six sets of two hexadecimal digits, separated with periods.
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 IGMP ICMP DNS
ARP Hosts use Address Resolution Protocol (ARP) to discover a host's hardware address.
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 Punch down tool Snips Crimping tool
Cable stripper
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? Vertical cross connect Punch down block Demarc IDF
Demarc
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 Hub Switch Router
Firewall
Which of the following creates a visual representation of physical components along with a clearly defined set of principles and procedures? Logical network diagram Rack diagram Floor plan Wiring diagram
Floor plan A floor plan creates a visual representation of physical components along with a clearly defined set of principles and procedures. A logical network diagram isn't so much about the physical layout of devices, but more of how traffic flows across the network. A rack diagram, or rack elevation, is a map of the IT equipment layout within a server rack. A wiring diagram is a map of the physical connections and physical layout of the electrical and circuit systems in a building.
Which of the following are advantages of using fiber optic cabling for a network? (Select two.) Easy to work with Lower installation cost No special training or equipment is required Greater cable distances without a repeater Immunity to electromagnetic interference
Immunity to electromagnetic interference Greater cable distances without a repeater
Which of the following BEST describes how a switch functions? It connects multiple cable segments (or devices) and broadcasts frames to all of its ports. It connects multiple segments of different architectures. It translates frames and forwards them to the appropriate segment. It connects multiple segments of different architectures. It translates frames and broadcasts them to all of its ports. It connects multiple cable segments (or devices) and forwards frames to the appropriate segment.
It connects multiple cable segments (or devices) and forwards frames to the appropriate segment.
Which of the following are true about a MAC address? (Select two.) It is a 48-bit address. It is a 64-bit address. It is a 32-bit address. It is typically represented by octets of decimal numbers between 0-255. It is typically represented by hexadecimal numbers.
It is a 48-bit address. It is typically represented by hexadecimal numbers. An IPv4 address is 32 bits and uses octets of decimal numbers between 0-255. An IPv6 address is a 64-bit address that uses 32 hexadecimal numbers.
Which of the following statements accurately describe how a modem works? (Select two.) It modulates digital data from a PC into analog data and transmits it on a telephone network. It modulates digital data from a telephone network into analog data that a PC can use. It communicates over a telephone network using digital signals. It demodulates analog PC data into digital data that can be transmitted through a telephone network. 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. It demodulates analog data from a telephone network into digital PC data.
Which of the following are characteristics of a coaxial network cable? (Select two.) It has a conductor made from copper in its center. The conductors within the cable are twisted around each other to eliminate crosstalk. It is composed of four pairs of 22-gauge copper wire. It uses RJ45 connectors. It uses two concentric metallic conductors.
It uses two concentric metallic conductors. It has a conductor made from copper in its center.
Which of the following terms identifies the wiring closet in the basement or ground floor that typically includes the demarcation point? Answer Horizontal cross connect MDF IDF 110 block
MDF
Which of the following connectors are used with fiber optic cables and include both cables in a single connector? (Select two.) MTRJ BNC ST SC LC
MTRJ and LC
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 Repeater Hub Bridge
Media converter Use a media converter to convert from one media type to another within the same architecture. Use a bridge to connect two devices that use different network architectures. For example, you can use a bridge to connect a wired network to wireless clients. A hub or repeater connects devices using the same media type.
You want to measure the voltage, amps, and ohms of various devices. Which tool should you use? Toner probe Voltage event recorder Certifier Multimeter
Multimeter most multimeters can measure: AC and DC voltage Current (amps) Resistance (ohms) Capacitance Frequency
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 implementation work? Yes. All of the requirements for implementing a fiber optic network have been met. No. You should use single-mode patch cables to connect a GBIC module to a switch. No. You should purchase patch cables that use MTRJ connectors. No. You should use a specialized backbone fiber optic switch to create a backbone network for routers.
No. You should purchase patch cables that use MTRJ connectors. For light to pass through a fiber optic connector, the fiber within the jack must line up perfectly with the fiber in the connector. Using the wrong connector will result in misaligned fibers. This will disrupt the light signal, even if you're able to successfully lock the connector into the jack. In this scenario, you should purchase patch cables that use MT-RJ 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 should purchase fiber optic equipment that use FC connectors. No. You shouldn't use standard fiber optic switches to create a backbone network for routers. No. You shouldn't use multi-mode patch cables with single-mode GBIC modules. Yes. All of the requirements for implementing a fiber optic network have been met.
No. You shouldn't use multi-mode patch cables with single-mode GBIC modules. Some GBIC/SFP modules use multi-mode fiber, while others use single-mode. You must use the correct type of fiber optic cable and connector required by the specific adapter. You can't mix and match different types of cable. In this scenario, connecting a single-mode GBIC to multi-mode fiber will introduce a catastrophic signal loss of up to 99%.
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? Multimeter Toner probe OTDR Smartjack
OTDR An optical time domain reflector (OTDR) sends light pulses on a cable to discover information about the cable. The results of this test can be used to: Estimate a wire's length. Measure a cable's impedance. Identify locations of splices and connectors on a wire. Identify shorts, open circuits, and fault locations.
At which layer of the OSI model do hubs operate? Physical Layer 3 Internet Data Link
Physical Hubs operate at Layer 1, or the Physical layer of the OSI model.
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? Cat 3 RG-58 RG-59 Cat 5e
RG-59
Which of the following hardware devices regenerate a signal out of all connected ports without examining the frame or packet contents? (Select two.) Bridge Switch Repeater Hub Router
Repeater Hub
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? Demarc extension Horizontal cross connect Demarc Smartjack
Smartjack A smartjack is a special loopback plug installed at a WAN service's demarcation point. Technicians at the central office can send diagnostic commands to the plug to test connectivity between the central office and the demarc.
Which of the following are characteristics of an LC fiber optic connector? (Select two.) They use a one-piece bayonet connecting system. They can be used with either fiber optic or copper cabling. They are half the size of standard connectors. They use a housing and latch system similar to an RJ45 UTP connector. They are threaded.
They are half the size of standard connectors. They use a housing and latch system similar to an RJ45 UTP connector.
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.) (picture of a crossover cable with no open pins)
This is a crossover cable. The cable is functioning correctly. In this display, the cable being tested is a correctly wired crossover cable. Output with (x) characters between pins indicates that they're shorted. Straight-through connections are displayed using (-) characters in the cable certifier's output. Open connections are displayed with no characters or lines between pin numbers.
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. White with orange stripe White with green stripe Solid brown Solid blue Solid green White with brown stripe White with blue stripe Solid orange Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
White with orange stripe Solid orange White with green stripe Solid blue White with blue stripe Solid green White with brown stripe Solid brown
