单选题Which of the following cable types is intended to be used on short distances and is immune to anytype of interference?（）A Singlemode fiberB Multimode fiberC Shielded twisted pairD Unshielded twisted pair

A. Singlemode fiber

B. Multimode fiber

C. Shielded twisted pair

D. Unshielded twisted pair

A. Single-mode fiber

B. Multimode fiber

C. Copper

D. Wireless

● (71) In the strength of the carrier signal is varied to represent binary 1 or 0．

(72) is a system that can map a name to an address and conversely an address to an name．

(73) is a three-way handshaking authentication protocol that it's packets are encapsulated in the point-to-point protocol

(74) is an approach that enables an ATM Switch to behave like a LAN switch．

(75) is an guided media which is made of glass or plastic and transmits signals in the form. of light．

(71) A．ASK

B．PSK

C．FSK

D．FDM

(72) A．NAT

B．NCP

C．DDN

D．DNS

(73) A．PPP

B．PAP

C．CHAP

D．LCP

(74) A．VLAN

B．LANE

C．VPN

D．IPOA

(75) A．Coaxial cable

B．Optical fiber

C．Unshielded Twisted-pair Cable

D．Shielded Twisted-pair Cable

100BASE-TX makes use of two pairs of twisted pair cable, one pair used for transmission and the other for(69).

A．reception

B．detection

C．relation

D．connection

A. UTP

B. Fiber

C. RG-6

D. STP

A. Plenum

B. Fiber optic

C. Twisted pair

D. Coaxial

A. BNC

B. RJ-45

C. F

D. HDMI

A.Fiber

B.T568A

C.IEEE1394

D.CAT5

A. Fiber

B. Coaxial cable

C. UTP

D. Twisted pair

A. crossover

B. straight-through

C. rolled

D. shielded twisted-pair