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?

255.248.0.0
255.252.0.0
255.254.0.0
255.224.0.0
255.240.0.0

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

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

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Computer Networking
Which of the following is true when describing a unicast address?

Packets addressed to a unicast address are delivered to a single interface.
These are like private addresses in IPv4 in that they are not meant to be routed.
These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.
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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Computer Networking
The Internet Control Message Protocol (ICMP)

All of these
reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem
None of these
provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another
allows gateways to send error a control messages to other gateways or hosts

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