CCNA 1 Chapter 3: Networking Media Transmission

What type of cable should be used to connect a PC to a switch?

Straight-through cable

Which devices use pins 1 and 2 to transmit data?

PCs

What type of light is typically used in fiber-optic cabling?

Infrared light

Why should you not look into an end of a fiber optic cable that is connected to a device?

Risk of eye damage Signup and view all the answers

When should a crossover cable be used for connection?

When connecting two devices with different transmit pins Signup and view all the answers

Which of the following is an accurate statement about digital transmission?

All of the above are accurate ways digital transmission can be achieved. Signup and view all the answers

What is the primary difference between shielded twisted-pair (STP) and unshielded twisted-pair (UTP) cable?

STP cable includes an additional shielding layer around the twisted pairs, while UTP cable does not. Signup and view all the answers

Which of the following statements about copper media is accurate?

Copper media requires an introductory knowledge of physics or chemistry to understand the basics of electricity. Signup and view all the answers

What is the primary advantage of using UTP cable over STP cable?

UTP cable is more flexible and easier to route than STP cable. Signup and view all the answers

What is the purpose of the twisted-pair design in UTP and STP cables?

To reduce electromagnetic interference (EMI) and crosstalk between the pairs. Signup and view all the answers

Which of the following best describes the three main types of electrical materials mentioned in the text?

Insulators, conductors, and semiconductors are classified based on the force required to move their electrons from orbit. Signup and view all the answers

Which organization(s) define(s) the standards for commercial building telecommunication cabling, including rules for using unshielded twisted-pair cabling and connector pin assignments?

The Telecommunications Industry Association (TIA) and the Electronic Industries Alliance (EIA) Signup and view all the answers

What is the primary purpose of the shielding in STP cable?

To reduce electromagnetic interference (EMI) and crosstalk between the pairs. Signup and view all the answers

Which organization is responsible for defining LAN standards such as the 802.3 standard used for Ethernet?

The Institute of Electrical and Electronic Engineers (IEEE) Signup and view all the answers

What is the key difference between the pinout used for a straight-through Ethernet cable and the pinout used for a crossover Ethernet cable?

The order of the wire pairs is reversed in the crossover cable. Signup and view all the answers

What is the main advantage of coaxial cable over twisted-pair cable?

Coaxial cable can transmit data over longer distances without the need for repeaters. Signup and view all the answers

What is one of the points of comparison for networking cable?

The data transmission speeds that can be achieved Signup and view all the answers

What is the primary function of the braided copper shielding in a coaxial cable?

To reduce electromagnetic interference (EMI) and crosstalk between the cable components. Signup and view all the answers

What is the purpose of the pair shield in STP cable?

To reduce electromagnetic interference (EMI) and crosstalk between the individual wire pairs. Signup and view all the answers

What is the primary advantage of using a crossover cable instead of a straight-through cable to connect two similar devices, such as two PCs with NICs?

The crossover cable allows the devices to communicate by switching the transmit and receive wire pairs. Signup and view all the answers

What is the purpose of the overall shield in STP cable?

To reduce electromagnetic interference (EMI) and crosstalk between all the wire pairs in the cable. Signup and view all the answers

Which component of an optical fiber cable reflects light back into the core?

The cladding Signup and view all the answers

What is the primary advantage of single-mode fiber over multimode fiber?

Both higher data rates and longer distances Signup and view all the answers

What is the minimum number of devices required to set up a wireless LAN (WLAN)?

2 Signup and view all the answers

Which IEEE standard for wireless networking operates in the 5 GHz frequency band?

802.11a Signup and view all the answers

What is the primary function of the buffer in an optical fiber cable?

To provide protection and strength Signup and view all the answers

In a WLAN infrastructure mode, what device is typically used as a central hub?

An access point (AP) Signup and view all the answers

Which of the following statements about fiber-optic cabling is true?

Fiber-optic cabling is more secure because it is difficult to tap into the optical signals. Signup and view all the answers

What is the raw material used to manufacture fiber-optic cables?

Sand Signup and view all the answers

Which of the following is NOT a component of a fiber-optic cable?

Insulation Signup and view all the answers

What is the primary difference between single-mode and multimode fiber-optic cables?

Single-mode cables support longer transmission distances than multimode cables. Signup and view all the answers

Which of the following is NOT a characteristic of wireless media?

Wireless media requires a conductor like a copper wire. Signup and view all the answers

In a typical enterprise WLAN design, what is the role of an access point (AP)?

To provide wireless connectivity to end-user devices. Signup and view all the answers

What is the purpose of the Service Set Identifier (SSID) in a WLAN?

To identify the wireless network and allow devices to associate with it. Signup and view all the answers

Which of the following is NOT one of the physical layer transmission options defined by the 802.11 standard for WLANs?

Time Division Multiple Access (TDMA) Signup and view all the answers

Which of the following statements about copper cabling is true?

Copper cabling carries information using electrical current. Signup and view all the answers

What is the purpose of a crossover cable in a network?

To connect two switches or similar devices. Signup and view all the answers