When a phone is lifted off-hook, it connects the two wires causing an electrical signal to flow from the phone exchange to the phone. What is this electrical signal called?
A. Off-hook signal
B. Ground start signal
C. Loop start signal
D. On-hook signal
Andrew is working for a television station in North America and South America.
What video standard is more possibly be used with the video stored in the archives of these stations?
A. PAL
B. NTSC
C. SECAM
D. IEEE 1394
Which of the following layers of the OSI model manages communication between communication entities in a network?
A. Presentation
B. Network
C. Transport
D. Session
E. Application
You work as a Network Administrator for McNeil Inc. The company has a TCP/IP-based network.
Performance of the network is slow because of heavy traffic. A hub is used as a central connecting device
in the network.
Which of the following devices can be used in place of a hub to control the network traffic efficiently?
A. Repeater
B. Router
C. Switch
D. Bridge
You have just set up a wireless network for customers at a coffee shop. Which of the following are good security measures to implement?
Each correct answer represents a complete solution. Choose two.
A. Not broadcasting SSID
B. MAC filtering the router
C. Using WEP encryption
D. Using WPA encryption
Which of the following protocols is used by VoIP applications for communication initiation in the network?
A. TLS
B. NTP
C. SIP
D. SSH
Which of the following standards designates international numbering plans for devices connected to the PSTN?
A. E.164
B. ITU-T
C. IETF
D. T-161
Which of the following devices is used to create VLANs in a small network?
A. Repeater
B. Switch
C. Hub
D. Bridge
Which of the following protocols provides sequence numbers to VoIP packets?
A. TCP
B. RTP
C. UDP
D. SCCP
Which of the following are examples of interactive communication? Each correct answer represents a complete solution. Choose all that apply.
A. Video Conferencing
B. E-mail
C. Fax
D. Phone call
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