Infrastructure (2) Flashcards
Ralph has been hired by a client to install cabling to connect two existing networks. The two networks are in different buildings approximately 1,000 feet apart. The cable type must support Gigabit Ethernet data rates of 1,000 megabits per second (Mbps) and provide a high level of resistance to electromagnetic interference (EMI). Your client wants the most economical cabling solution that meets their needs. Which of the following cable types best meets the needs of this client?
Multimode fiber-optic cable
Shielded twisted pair (STP) cable
Unshielded twisted pair (UTP) cable
Multimode fiber-optic cable
Multimode fiber-optic cable best meets the client’s needs. Fiber-optic cable supports the required 1000 Mbps data rate and can connect networks that are more than 1,000 feet apart. Fiber-optic cable is immune to EMI. Although both multimode and single-mode fiber would meet the corporation’s general needs, multimode is best in this scenario because it is less expensive than single-mode fiber. Twisted pair wiring (STP or UTP) meets the data rate and cost requirements but does not support connections longer than 100 meters. Thin coaxial cable does not support the data rate or distances longer than 185 meters
Which of the following are connector types used with coaxial cables? (Choose all correct answers.)
BNC
F-type
N-type
ST
RJ-11
BNC
F-type
N-type
BNC connectors are used for coaxial Thin Ethernet networks, and N-type connectors with Thick Ethernet. F-type connectors are used for coaxial cable television installations. Straight tip (ST) connectors are used with fiber-optic cable, and RJ11 connectors are used for telephone installations
Alice has been hired by a corporation to design the cabling for their network. The corporation just moved in to two different floors of an older building, a retail space on the ground floor and an office space on the 43rd floor. The building has existing Category 5 (CAT5) unshielded twisted pair (UTP) cable. Alice’s client wants two separate local area networks (LANs), one on each of the two floors, with a backbone network connecting them. They want a 1 gigabit per second (Gbps) data rate for each LAN but plan on migrating to 10 Gbps in the future. The two networks are approximately 200 meters apart. Which of the following solutions best meets the client’s needs?
Install Category 6 (CAT6) or Category 6a (CAT6a) UTP cable for the LANs. These cables run at 1 Gbps and provide a migration path to 10 Gbps. Use twisted pair cable for the backbone network.
Use the existing CAT5 cabling for the LANs since CAT5 runs at 1 Gbps. Use thick coaxial cable for the backbone network.
Install CAT6 or CAT6a UTP cable for the LANs. These cables run at 1 Gbps and provide a migration path to 10 Gbps. Use multimode fiber-optic cable for the backbone network.
Install CAT6 or CAT6a UTP cable for the LANs. These cables run at 1 Gbps and provide a migration path to 10 Gbps. Use multimode fiber-optic cable for the backbone network.
Either CAT6 or CAT6a UTP cable will provide the currently required 1 Gbps data rate, with a migration path to 10 Gbps in the future. The backbone cabling connecting the two LANs needs to be fiber optic, since it exceeds the distance limitations of twisted pair and coaxial cable. CAT5 cable conceivably runs at 1 Gbps; however, it does not run at 10 Gbps.
A maintenance worker, while replacing a light fixture in an office building, accidentally severs a network cable in the drop ceiling. The tenants use a variety of local area network (LAN) technologies throughout the structure, but on that particular floor there are three separate LANs: a 10-node Thin Ethernet LAN using coaxial cable in a bus topology, a 25-node Gigabit Ethernet LAN using twisted pair cable in a star topology, and a 5-node Fiber Distributed Data Interface (FDDI) LAN using multimode fiber-optic cable in a double ring topology. Without knowing which of the LANs the severed cable belongs to, what is the maximum number of computers that could be directly affected by the cable break?
1
5
10
10
The Thin Ethernet LAN is the network most endangered by the cable break. If a bus network is severed, all of the workstations on it are affected because the cable segments are no longer terminated at one end. The Gigabit Ethernet network uses a star topology, which means that only the one computer using the severed cable could be disconnected from the network. An FDDI double ring network can survive a single cable break without any workstations being affected
In the punchdown process for unshielded twisted pair (UTP) cable, which of the following is the last step that you perform when connecting bulk cables to jacks in wall plates and patch panels?
Cut off the excess wire that protrudes past the contacts.
Press the bare wire down between the two metal contacts that hold it in place.
Strip some of the insulating sheath off the cable end to expose the wires.
Cut off the excess wire that protrudes past the contacts.
You use a punchdown block tool to connect the ends of bulk cable runs to jacks in wall plates and patch panels. The steps of the process are as follows:
Strip some of the insulating sheath off the cable end to expose the wires.
Separate the twisted wire pairs at the ends.
Strip a small amount of insulation off each wire.
Insert the wires into the appropriate contacts in the jack.
Press the bare wire down between the two metal contacts that hold it in place.
Cut off the excess wire that protrudes past the contacts.
You must repeat the process of punching down for both ends of your internal cable runs.
Which of the following cable connector types is not used with fiber-optic cable?
Straight tip (ST)
Subscriber connector (SC)
F-type
F-type
ST, SC, fiber LC, and MTRJ are all connectors used with fiber-optic cables. F-type connectors are used with coaxial cables
Which of the following twisted pair cable types can you use to construct a 10GBase-T network with 100-meter segments? (Choose all correct answers.)
CAT5
CAT5e
CAT6
CAT6a
CAT7
CAT6a
CAT7
Category 6a (CAT6a) twisted pair cable is a variant on CAT6 that enables you to create 10GBase-T networks with segments up to 100 meters long. Category 7 (CAT7) cable adds shielding both to the individual wire pairs and to the entire cable, for even greater resistance to crosstalk and noise. CAT7 supports 100-meter 10GBase-T segments as well. CAT5 and CAT5e are not suitable for use with 10GBase-T. You can use CAT6 for 10GBase-T, but it is limited to 55-meter segments
Which of the following cable connector types have been rendered nearly obsolete by Universal Serial Bus (USB) connections? (Choose all correct answers.)
BNC
RJ-11
DB-9
DB-25
DB-9
DB-25
The DB-9 and DB-25 connectors were at one time ubiquitous on personal computers, providing peripheral connections to modems, printers, and other devices. They have since been largely eliminated in favor of USB. BNC connectors were used for Thin Ethernet networking, but they have been replaced by unshielded twisted pair (UTP) cable with RJ45 connectors. RJ11 connectors are used for telephone connections
Which of the following twisted pair cable types is rated for both a 10-megabit-per-second (Mbps) data rate (using two pairs) and a 100-Mbps data rate (using four pairs)?
Category 3 (CAT3)
Category 5 (CAT5)
Category 5e (CAT5e)
Category 3 (CAT3)
CAT3 cable was originally intended for use in voice-grade telephone networks but was later certified for use in data networks. CAT3 cable can support data transfer rates from 4 Mbps up to 100 Mbps (using the now-deprecated 100Base-T4 and 100VG-AnyLAN standards). Although this type of cable could run at 100 Mbps, it was seldom used at speeds greater than 10 Mbps. CAT5 cable was the primary replacement for CAT3, supporting data rates up to 100 Mbps. CAT5e and CAT6 are rated for data rates up to 1 Gbps, as on Gigabit Ethernet networks. CAT6 can even support 10 Gbps transfer rates over shorter distances
Ed has been hired to install network cabling for a small private company with 15 employees who need to share files and printers. All of the employees are physically located within the same building in two separate office spaces directly adjacent to each other, sharing a common wall and door for access. Both offices have drop ceilings. The client wants a simple Gigabit Ethernet installation that’s easy to troubleshoot. In addition, Ed’s client wants to keep installation costs to a minimum. Which of the following combinations of topology, cable type, and installation method would best meet the needs of Ed’s client?
Bus topology, twisted pair cabling, and internal installation
Star topology, coaxial cabling, and external installation
Star topology, twisted pair cabling, and external installation
Star topology, twisted pair cabling, and external installation
Because the company has few employees, they are in a single location, and the client is concerned with minimizing the cost, the best solution is to use a star topology with prefabricated twisted pair cabling and an external installation method. The star topology uses a central switch. Ed can use two switches, one in each room, to connect computers to the network. Prefabricated twisted pair cabling, which has the connectors already attached and is available in specific lengths, will keep the cost to a minimum. Since the employees are all located in the same building, with a common wall and door and a drop ceiling, the external installation method is the best choice. It is not possible to use a bus topology or coaxial cable for Gigabit Ethernet. Ed could conceivably use fiber-optic cable in a star topology for Gigabit Ethernet, but it is more difficult to install and very expensive. An internal installation, which uses a combination of bulk cable with no connectors and prefabricated cables, is more expensive than an external installation and is typically used for larger networks
Which of the following cable types are typically used in newly constructed local area network (LAN) installations? (Choose all correct answers.)
Single-mode fiber optic
Multimode fiber optic
Coaxial
Unshielded twisted pair
Multimode fiber optic
Unshielded twisted pair
The main cable types used in LANs today are multimode fiber optic and unshielded twisted pair. Single-mode fiber optic is used primarily for long-distance wide area network (WAN) connections, and coaxial cable is no longer used for LANs
Which of the following statements are true about coaxial cable? (Choose all correct answers.)
Coaxial cable has three conductors within the same sheath.
Coaxial cable has two conductors within the same sheath.
Coaxial cable has a copper core that carries light pulse signals.
Coaxial cable has a copper core that carries electrical signals.
Coaxial cable has an insulating outer sheath made of braided strands.
Coaxial cable has an insulating sheath made of either PVC or Teflon.
Coaxial cable has two conductors within the same sheath.
Coaxial cable has a copper core that carries electrical signals.
Coaxial cable has an insulating sheath made of either PVC or Teflon.
Coaxial cable has two conductors within the same sheath that share a common axis. These conductors are surrounded by an outer insulating sheath of either PVC or Teflon. Copper cables carry electrical signals. Only fiber-optic cables carry light pulse signals
Which of the following twisted pair cable types are rated for 1,000 megabit per second (Mbps) Gigabit Ethernet using two wire pairs? (Choose all correct answers.)
Category 3 (CAT3)
Category 5 (CAT5)
Category 5e (CAT5e)
Category 6 (CAT6)
Category 6a (CAT6a)
None of the above
None of the above
All twisted pair Gigabit Ethernet implementations require all four wire pairs to achieve 1000 Mbps transfer rates
Which of the following twisted pair cable types support both 10 megabit per second (Mbps) and 100 Mbps data rates, using only two pairs? (Choose all correct answers.)
Category 3 (CAT3)
Category 5 (CAT5)
Category 5e (CAT5e)
Category 6 (CAT6)
Category 5 (CAT5)
Category 5e (CAT5e)
Category 6 (CAT6)
CAT5 cable was the original cable standard intended for transfer rates up to 100 Mbps. CAT5e and CAT6 support 100 Mbps and are also rated for data rates up to 1000 Mbps. All three of these standards also support the 10 Mbps transfer rate. CAT3 can support both 10 and 100 Mbps, but it requires four pairs for 100 Mbps
Which of the following statements about fiber-optic cabling are true? (Choose all correct answers.)
There are two fiber-optic cable types: single-mode and multimode.
Fiber-optic cable is typically used to span long distances.
Fiber-optic cables use IBM data connector (IDC) connectors.
Fiber-optic cables use straight tip (ST) and subscriber connector (SC) connectors.
Single-mode fiber-optic cable uses a laser light source and a glass core.
Multimode fiber-optic cable uses a light-emitting diode (LED) light source.
There are two fiber-optic cable types: single-mode and multimode.
Fiber-optic cable is typically used to span long distances.
Fiber-optic cables use straight tip (ST) and subscriber connector (SC) connectors.
Single-mode fiber-optic cable uses a laser light source and a glass core.
Multimode fiber-optic cable uses a light-emitting diode (LED) light source.
Fiber-optic cable comes in two types: multimode and single-mode. Fiber-optic cables vary in light source (LED or laser), cable grade (glass or plastic), and size of the core conductor. Single-mode uses a higher-grade glass conductor with a laser light source. Multimode fiber uses an LED light source. Both types can use either ST or SC connectors to physically connect end devices to a fiber-optic network. Fiber-optic cable is used to extend networks over long distances. Fiber-optic cables do not use IDC connectors, which are intended for use with shielded twisted pair (STP) cable
