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Which of the following layers of the OSI model manages communication between communication entities in a network?

John works as a Network Administrator for Infonet Inc. The company has a Windows 2000 domainbased network. The network has ten Windows 2000 servers and 300 Windows 2000 Professional client computers. The network uses a T3 line to connect to the Internet. The company also has 1,000 external employees who need to connect to the company from remote locations. John wants to implement a remote access policy for external users, which will make access highly available and most secure.

He wants to accomplish the following goals:
No data traffic should be carried as clear text.
At least 200 remote users should be able to access the network simultaneously all the time.

What will he do to accomplish these tasks? Each correct answer represents a part of the solution. Choose three.

Which of the following provides users the ability to consistently access multiple message types through a single user interface?

Which of the following is a method of displaying multiple parties in a video conference?

All of the following components are required for a softphone end-point except for which one?

Which of the following is a signaling protocol?

What is the data rate of a BRI D channel?

You are increasing compression to reduce bandwidth consumption. What effect will this have on voice quality?

What is the bit rate of digitized voice using Pulse Code Modulation (PCM)?

Which of the following problems in a PSTN circuit can cause noise and thus reduces call quality?