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Terms in this set (25)
Appicaltion, Presentation, Session, Transport, Network, Data link, Physical
Name the 7 layers of the OSI model
First Three Layers, (A,P,S)
Name OSI layers that deal with application issues ?
Last four layers(T,N,D,PH)
Name the OSI layer that deal with data transport issue ?
Application programs used at the application layer of the OSI Model include word processing.
Upper layers of the OSI Model are usually implemented in hardware devices.
Continuous waveform, State of signal (voltage level, etc.) varies continuously among an infinite number of states
Discrete (non-continuous) waveform, State of signal remain constant during each clock-cycle, Few possible states
Few possible states (2-64 states)
exactly 2 states
dB = 10 log10 (P2 / P1)->dB = 10 log10 (5/10)->dB = 10 log10 (0.5)->dB = 10 (-0.3)->dB = -3
A signal starts at a transmitter with 10 watts of power and arrived at a receiver with 5 watts of power. Calculate the loss of power in dB.
80000 / 60 = 1333.33 Hz
What is the frequency (in Hz) of a signal that repeats 80000 times within one minute ?
|500 Hz - 50 Hz | = 450 Hz
What is the bandwidth of a signal composed of frequencies from 50 Hz to 500 Hz ?
Categories 3, 4, 5, 6, 7, 8
What categories of twisted pair are usually used in LANs ?
Advantage: better level of isolation from interference. Disadvantage: cost
What are the advantages and disadvantages of STP compared to UTP ?
Baseband transmit signals in a single channel, whereas broadband uses multiple channels.
What is the main difference between Baseband coaxial cable and Broadband coaxial cable ?
Speed, No significant noise, No interference, Long distance
What are the advantages of Optical fiber compared twisted pair and coaxial cable ?
Yes, you can (e.g. Digital Video Service or DVS). Noise used to be a limiting factor
Can you transmit video signal over twisted pair wire ? Explain
Convert this binary octet to a decimal: 10100011
When you have the domain name or the host name (e.g., cnn.com) and need the corresponding IP address.
When do we need DNS?
You send the domain name or host name (e.g., cnn.com). You receive the corresponding IP address.
What information do you send in a DNS request message? What information do you receive in a DNS response message?
You get a temporary IP address at a minimum. You can also get the DNS server's IP address.
What information do we get back, at a minimum, in an autoconfiguration (DHCP) response message? What other information may we get back?
Yes, all computers need an IP address to be on the internet
Does a server host need an IP address?
YES. All computers need an IP address
Does your home PC need an IP address when you are on the Internet?
YES and NO. If you know its IP address, you can reach a server without using its host name (e.g. cnn.com). Because IP address are numbers that are not easy for human being to memorize, a server must have a host name (e.g., cnn.com) for most users to reach it.
Does a server host need a host name?
NO, it only needs an IP address
Does your home PC need a host name when you are on the Internet?
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