Computer Networking
What command will permit SMTP mail to only host 1.1.1.1?

access-list 10 permit tcp any host 1.1.1.1 eq smtp
access-list 10 permit smtp host 1.1.1.1
access-list 110 permit tcp any host 1.1.1.1 eq smtp
access-list 110 permit ip smtp host 1.1.1.1

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Computer Networking
A front-end processor is

a user computer system
preliminary processor of batch jobs.
a processor in a large-scale computer that executes operating system instructions
a minicomputer that relieves main-frame computers at a computer centre of communications control functions
None of these

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Computer Networking
Why does the data communication industry use the layered OSI reference model?1. It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.2. It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.3. It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.4. It encourages industry standardization by defining what functions occur at each layer of the model.

1 only
3 only
2 and 3
1 and 4

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