Network Administration Questions

Q:

What is WDM?

Answer

WDM is conceptually the same as FDM, except that the multiplexing and demultiplexing  involve light signals transmitted through fiber optics channel.

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Q:

What is the difference between a Hub and a Switch?

Answer

Hub is device to connect two devices, switch is a network bridge which processes and routes data approirately over network layer of OSI Reference model

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Q:

What is the way in which the Asynchronous Transfer Mode works?

Answer

The Asynchronous Transfer Mode or ATM is a connection technology that works by transmitting data into organized 53 bytes (small) packages through a physical environment with a high efficiency. Packing data into small cells reduces transportation delay so the speeds reached by this technology are very high; it can reach even 10 Gb per second.

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Q:

What is traffic shaping?

Answer

One of the main causes of congestion is that traffic is often busy. If hosts could be made to transmit at a uniform rate, congestion would be less common. Another open loop method to help manage congestion is forcing the packet to be transmitted at a more predictable rate. This is called traffic shaping.

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Q:

What does a VLAN do?

A) Breaks up broadcast domains in a layer 2 switch internetwork B) Provides multiple broadcast domains within a single collision domain
C) Provides multiple collision domains on one switch port D) Acts as the fastest port to all servers
 
Answer & Explanation Answer: A) Breaks up broadcast domains in a layer 2 switch internetwork

Explanation:

virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). LAN is the abbreviation for local area network and in this context, virtual refers to a physical object recreated and altered by additional logic.

VLANs work by applying tags to network packets and handling these tags in networking systems – creating the appearance and functionality of network traffic that is physically on a single network but acts as if it is split between separate networks. In this way, VLANs can keep network applications separate despite being connected to the same physical network, and without requiring multiple sets of cabling and networking devices to be deployed.

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Q:

When would you use the ping command with the "-t" switch?

Answer

to get the ping back from other computer with no packet loss

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Q:

What are the differences between static ip addressing and dynamic ip addressing?

Answer

With static IP addressing, a computer (or other device) is configured to always use the same IP address. With dynamic addressing, the IP address can change periodically and is managed by a centralized network service

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Q:

Which of the following identifies broadband internet connections?

A) IP, Wi-Fi, FTTP B) FTP, OSP, IP
C) OSP, cellular radio network, FTP D) DSL, Wi-Fi, fixed wireless
 
Answer & Explanation Answer: D) DSL, Wi-Fi, fixed wireless

Explanation:

Internet Service Provider (ISP) is a company offering access to internet. They offer various services:

1. Internet Access

2. Domain name registration

3. Dial-up access

4. Leased line access

 

There exist several ways to connect to the internet. Following are these connection types available:

* Dial-up Connection

* ISDN

* DSL

* Cable TV Internet connections

* Satellite Internet connections

* Wireless Internet Connections

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