Computer Networking
The physical layer, in reference to the OSI model, defines

the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service
None of these
data link procedures that provide for the exchange of data via frames that can be sent and received
All of these

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Computer Networking
You are working with a network that has the network ID 10.9.0.0 and contains 73 networks. In the next year, you will be adding an additional 27 branch offices to your company. For simplified management, you want to keep the most possible hosts per subnet. Which subnet mask should you management, you want to keep the most possible hosts per subnet. Which subnet mask should you use?

255.224.0.0
255.252.0.0
255.248.0.0
255.254.0.0
255.240.0.0

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Computer Networking
Which of the following is true when describing an anycast address?

Packets addressed to a unicast address are delivered to a single interface.
Packets are delivered to all interfaces identified by the address. This is also called one-to-many addresses.
This address identifies multiple interfaces and the anycast packet is only delivered to one address. This address can also be called one-to-one-of-many.
These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.

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