Communication networks can be classified in terms of their physical arrangement or (73) Three common (73) are the star,bus,and ring.(73)

A．structures

B．topologies

C．protocols

D．frames

[单选题]C．ommunication networks can be classified in terms of their physical arrangement or(73)Three common(73)are the star, bus, and ring.A．structuresB．topologiesC．protocolsD．frames

[单选题]Communication networks can be classified in terms of their physical arrange

[单选题]Networks can be interconnected by different devices．In the physical layer，networks can be connected by (66) or Hubs，which just move the bits from one network to an identical network．One layer up we find bridgas and swiehes,which operate at data link

[单选题] Networks can be interconnected by different devices. In the physical layer，networks can be connected by（1）or hubs，which just move the bits from one network to an identical network. One layer up we find bridges and switches，which operate at data link

[单选题]Networks can be interconnected by different devices. In the physical layer, networks can be connected by(66)or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data l

[单选题]Networks can be interconnected by different devices in the physical layer networks can be connected by (71) or hubs．which just move the bits from one network to an identical network．One layer up we find bridges and switches which operate at data link

[单选题]( )is an error detection code that most data communication networks use.A.C

[单选题]( )functions with two layers of protocols.It can connect networks of differ

[单选题]Wireless telecommunications networks are generally implemented and administered using（）communication.This implementation takes place at the （）level of OSI model network structure.A．microwave B．radio C．FM D．AMA．physical B．link C．network D．transport

[单选题]A．n internet is a combination of networks connected by()A．modemsB．routersC．switchesD．computers