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156 . _______are hardware and software combinations that connect devices running different native protocols.
A. Ports B. Gateways
C. Models D. Protocols

157 . Which is the lowest layer of TCP/IP model:
A. Application Layer
B. Host to Host Laye
C. Network Access Layers
D. Internet Layer

158 . In an email address, the symbol that is used to separate the user name and the domain name is
A. @ B. -
C. # D. ://