1. Which type of network cable contains multiple copper wires and uses extra shielding to prevent interference?
- fiber-optic
- coax
- STP
- UTP
Explanation: Shielded twisted-pair (STP) cables contain additional shielding and is commonly used when EMI or RFI interference would negatively affect the data communication crossing a network cable.
2. Which type of data cable is used by television companies to carry data and video signals?
- coaxial
- shielded twisted-pair
- unshielded twisted-pair
- fiber-optic
Explanation: Cable television companies and satellite communication systems both use copper or aluminum coaxial cable for connections between devices.
3. Which term describes the interference when electrical impulses from one cable cross over to an adjacent cable?
- RFI
- crosstalk
- crossover
- collision
Explanation: Crosstalk occurs when cables are bundled together for long lengths and the electrical impulses from one cable cross over to an adjacent cable
4. A group of newly hired entry-level network engineers are talking about the network cabling they are going to have to install as a team. What is a characteristic of Ethernet straight-through UTP cable?
- It can only use the T568A standard at both ends of the cable.
- It is susceptible to interferences from EMI and RFI.
- It can be used to connect two network hosts.
- It is Cisco proprietary.
Explanation: Ethernet straight-through UTP cable is commonly used to interconnect a host to a switch and a switch to a router. It can use one standard (T568A or T568B) at both ends. EMI and RFI signals can distort and corrupt the data signals being carried by copper media.
5. A network specialist has been hired to install a network in a company that assembles airplane engines. Because of the nature of the business, the area is highly affected by electromagnetic interference. Which type of network media should be recommended so that the data communication will not be affected by EMI?
- UTP
- STP
- fiber optic
- coaxial
Explanation: Optical fiber uses light to transmit signals. Therefore, fiber-optic cable is not affected by EMI or RFI.
6. Which type of network cable is commonly used in backbone networks and telephone companies?
- coaxial cable
- shielded twisted-pair cable
- twisted-pair cable
- fiber-optic cable
Explanation: Fiber-optic cables can carry very large amounts of data and are used extensively by telephone companies and in backbone networks.
7. Which type of Ethernet cable should be used to directly connect two devices that both use the same pins for transmitting and receiving data?
- crossover twisted-pair cable
- straight-through twisted-pair cable
- coaxial cable
- fiber-optic cable
Explanation: Devices that use the same pins to transmit and receive data require the use of a crossover cable in order to successfully exchange data.
8. Which command can be used to verify connectivity between two host devices?
- netstat
- ipconfig
- nslookup
- ping
Explanation: The ping command can be used to test end-to-end connectivity between two host devices. It measures the round-trip time for a message to get from source to destination.
9. Refer to the exhibit. One end of the cable is terminated as displayed, and the other end is terminated in accordance with the T568A standard. What type of cable would be created in this manner?
- fiber-optic
- straight-through
- crossover
- rollover
Explanation: A straight-through cable can have either a T568A or T568B standard termination at one end and the same at the other end. A crossover cable has a T568A standard termination at one end and a T568B standard at the other end. A rollover cable can have either a T568A or T568B standard termination at one end, and at the other end have the same standard, but with the wires connected in reverse order. A fiber-optic cable is not terminated using RJ-45 connectors.
10. What is a purpose of an IP address?
- It identifies a location in memory from which a program runs.
- It identifies a return address for replying to email messages.
- It identifies the physical location of a data center.
- It identifies the source and destination of data packets.
Explanation: Packets that are routed across the Internet contain source and destination IP addresses. These addresses are used to determine how the packets should be routed from source to destination by intermediate devices.
11. A network administrator would like to determine the path a packet takes to reach the destination 192.168.1.1. What is the best command to determine the network path?
- ipconfig 192.168.1.1
- ping 127.0.0.1
- ping 192.168.1.1
- tracert 192.168.1.1
Explanation: The traceroute (tracert) command is used to verify the path to a destination device. The ping command is used to verify Layer 3 connectivity. The ipconfig command is used to display the IP address on a device.