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INTRODUCTION TO COMPUTER NETWORKS

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• Engineering Mathematics
• Discrete Mathematics
• Operating System
• Computer Networks
• Digital Logic and Design
• C Programming
• Data Structures
• Theory of Computation
• Compiler Design
• Computer Org and Architecture

Basics of Computer Networking

• Types of Network Topology
• Transmission Modes in Computer Networks (Simplex, Half-Duplex and Full-Duplex)
• Manchester Encoding in Computer Network
• Difference between Broadband and Baseband Transmission
• What is OSI Model? - Layers of OSI Model
• TCP/IP Model
• Multiple Access Protocols in Computer Network
• Framing in Data Link Layer
• What is Ethernet?
• Ethernet Frame Format
• Token Ring frame format
• Difference between Byte stuffing and Bit stuffing
• Hamming Code in Computer Network
• Back-off Algorithm for CSMA/CD
• Collision Detection in CSMA/CD
• Efficiency of CSMA/CD
• Efficiency Of Token Ring
• Stop and Wait ARQ
• Sliding Window Protocol | Set 1 (Sender Side)
• What is MAC Address?
• Collision Avoidance in wireless networks
• Difference between Unicast, Broadcast and Multicast in Computer Network
• Collision Domain and Broadcast Domain in Computer Network
• Introduction of Classful IP Addressing

Computer Networking is the practice of connecting computers together to enable communication and data exchange between them. In general, Computer Network is a collection of two or more computers. It helps users to communicate more easily. In this article, we are going to discuss the basics which everyone must know before going deep into Computer Networking. 

Computer Networking

How Does a Computer Network Work?

Basics building blocks of a Computer network are Nodes and Links. A Network Node can be illustrated as Equipment for Data Communication like a Modem, Router, etc., or Equipment of a Data Terminal like connecting two computers or more. Link in Computer Networks can be defined as wires or cables or free space of wireless networks.

The working of Computer Networks can be simply defined as rules or protocols which help in sending and receiving data via the links which allow Computer networks to communicate. Each device has an IP Address, that helps in identifying a device.

Basic Terminologies of Computer Networks

• Network: A network is a collection of computers and devices that are connected together to enable communication and data exchange.
• Nodes: Nodes are devices that are connected to a network. These can include computers, Servers, Printers, Routers, Switches , and other devices.
• Protocol: A protocol is a set of rules and standards that govern how data is transmitted over a network. Examples of protocols include TCP/IP , HTTP , and FTP .
• Topology: Network topology refers to the physical and logical arrangement of nodes on a network. The common network topologies include bus, star, ring, mesh, and tree.
• Service Provider Networks: These types of Networks give permission to take Network Capacity and Functionality on lease from the Provider. Service Provider Networks include Wireless Communications, Data Carriers, etc.
• IP Address : An IP address is a unique numerical identifier that is assigned to every device on a network. IP addresses are used to identify devices and enable communication between them.
• DNS: The Domain Name System (DNS) is a protocol that is used to translate human-readable domain names (such as www.google.com) into IP addresses that computers can understand.
• Firewall: A firewall is a security device that is used to monitor and control incoming and outgoing network traffic. Firewalls are used to protect networks from unauthorized access and other security threats.

Types of Enterprise Computer Networks

• LAN: A Local Area Network (LAN) is a network that covers a small area, such as an office or a home. LANs are typically used to connect computers and other devices within a building or a campus.
• WAN: A Wide Area Network (WAN) is a network that covers a large geographic area, such as a city, country, or even the entire world. WANs are used to connect LANs together and are typically used for long-distance communication.
• Cloud Networks: Cloud Networks can be visualized with a Wide Area Network (WAN) as they can be hosted on public or private cloud service providers and cloud networks are available if there is a demand. Cloud Networks consist of Virtual Routers, Firewalls, etc.

These are just a few basic concepts of computer networking. Networking is a vast and complex field, and there are many more concepts and technologies involved in building and maintaining networks. Now we are going to discuss some more concepts on Computer Networking.

• Open system:  A system that is connected to the network and is ready for communication. 
• Closed system:  A system that is not connected to the network and can’t be communicated with.

Types of Computer Network Architecture

Computer Network falls under these broad Categories:

• Client-Server Architecture: Client-Server Architecture is a type of Computer Network Architecture in which Nodes can be Servers or Clients. Here, the server node can manage the Client Node Behaviour.
• Peer-to-Peer Architecture: In P2P (Peer-to-Peer) Architecture , there is not any concept of a Central Server. Each device is free for working as either client or server.

Network Devices

An interconnection of multiple devices, also known as hosts, that are connected using multiple paths for the purpose of sending/receiving data or media. Computer networks can also include multiple devices/mediums which help in the communication between two different devices; these are known as Network devices and include things such as routers, switches, hubs, and bridges. 

Network Topology

The Network Topology is the layout arrangement of the different devices in a network. Common examples include Bus, Star, Mesh, Ring, and Daisy chain. 

OSI Model  

OSI stands for Open Systems Interconnection . It is a reference model that specifies standards for communications protocols and also the functionalities of each layer. The OSI has been developed by the International Organization For Standardization and it is 7 layer architecture. Each layer of OSI has different functions and each layer has to follow different protocols. The 7 layers are as follows: 

• Physical Layer
• Data link Layer
• Network Layer
• Transport Layer
• Session Layer
• Presentation Layer
• Application Layer

A protocol is a set of rules or algorithms which define the way how two entities can communicate across the network and there exists a different protocol defined at each layer of the OSI model. A few such protocols are TCP, IP, UDP, ARP, DHCP, FTP, and so on. 

Unique Identifiers of Network 

Hostname: Each device in the network is associated with a unique device name known as Hostname. Type “hostname” in the command prompt(Administrator Mode) and press ‘Enter’, this displays the hostname of your machine.   

IP Address (Internet Protocol address):   Also known as the Logical Address, the IP Address is the network address of the system across the network. To identify each device in the world-wide-web, the Internet Assigned Numbers Authority (IANA) assigns an IPV4 (Version 4) address as a unique identifier to each device on the Internet. The length of an IPv4 address is 32 bits, hence, we have 2 32 IP addresses available. The length of an IPv6 address is 128 bits.

In Windows Type “ipconfig” in the command prompt and press ‘Enter’, this gives us the IP address of the device. For Linux, Type “ifconfig” in the terminal and press ‘Enter’ this gives us the IP address of the device.

MAC Address (Media Access Control address):  Also known as physical address, the MAC Address is the unique identifier of each host and is associated with its NIC (Network Interface Card) . A MAC address is assigned to the NIC at the time of manufacturing. The length of the MAC address is: 12-nibble/ 6 bytes/ 48 bits Type “ipconfig/all” in the command prompt and press ‘Enter’, this gives us the MAC address. 

Port:  A port can be referred to as a logical channel through which data can be sent/received to an application. Any host may have multiple applications running, and each of these applications is identified using the port number on which they are running. 

A port number is a 16-bit integer, hence, we have 2 16 ports available which are categorized as shown below: 

Number of ports: 65,536  Range: 0 – 65535  Type “ netstat -a ” in the command prompt and press ‘Enter’, this lists all the ports being used. 

List of Ports

Socket:  The unique combination of IP address and Port number together is termed a Socket. 

Other Related Concepts 

DNS Server:   DNS stands for Domain Name System . DNS is basically a server that translates web addresses or URLs (ex: www.google.com) into their corresponding IP addresses. We don’t have to remember all the IP addresses of each and every website. The command ‘ nslookup ’ gives you the IP address of the domain you are looking for. This also provides information on our DNS Server. \

Domain IP Address

ARP:   ARP stands for Address Resolution Protocol . It is used to convert an IP address to its corresponding physical address(i.e., MAC Address). ARP is used by the Data Link Layer to identify the MAC address of the Receiver’s machine. 

RARP:   RARP stands for Reverse Address Resolution Protocol . As the name suggests, it provides the IP address of the device given a physical address as input. But RARP has become obsolete since the time DHCP has come into the picture.

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Computer Networking Devices

Jul 29, 2014

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Computer Networking Devices. Seven Different Networking Components. What is a network device?. Components used to connect computers as well as other electrical devices together in order to share resources such as printers and fax machines. Devices used in Networking.

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Presentation Transcript

Computer Networking Devices Seven Different Networking Components

What is a network device? • Components used to connect computers as well as other electrical devices together in order to share resources such as printers and fax machines.

Devices used in Networking • The different devices or components used in networking include: • Hubs • Switches • Routers • Network bridges • Gateways • Firewalls • Wireless AP (Access Points)

What is a Hub? • A small rectangular box that joins computers together through ports on the back of the hub. • Picture of a 4 – Port Ethernet Hub (below) J Ethernet hub – Wikipedia. [online image]. Available en.wikipedia.org/wiki/Ethernet hub

How does a Hub work? • A hub receives data packets and passes on all the Information it receives to all the other computers connected to the hub. • Information is also sent to the computer that sent the information! • Example: if computer 1 wants to communicate with computer 3, the data will be sent to all the computers on the network since hubs do not know the destination of the information it receives.

Diagram of a hub network Main PC Hub Ethernet PC 1 PC 2

Additional Information about Hubs • Most hubs contain 4 ports some have 5 or more ports. • Hubs can be used for a smaller network such as a home network or a small office network. • Hubs are not that expensive most range for less than $30. • Hubs may not be the best option for sophisticated or complex networks.

What is a Switch? • Switches look similar to hubs in that they are rectangular in shape. Manageable switches are usually a little bigger than unmanageable switches. A switch also has ports on the back. Network switch – net gear.[online image]. Available http://www.senasum.blogspot.com, July 9, 2013

How does a Switch work? • Switches work about the same way as hubs. Unlike hubs, switches can identify the destination of a packet. • Switches send information only to the computer that is suppose to receive the information. • Switches can also send and retrieve information at the same time which makes sending information faster to retrieve than hubs.

Diagram of a Switch Network Switch Diagram. LindyConnectionPerfection.[online image]. Available http://www.lindy-international.com, July 9, 2013

Additional Information about Switches • Switches are a better option than hubs for larger networks or home networks with 4 or more connected computers. • Switches can range in price from $30 up to $100 or more depending on if the switch is manageable or unmanageable, usually unmanageable switches are less in price versus managed switches.

What is a Router? • A specialized computer programmed to interface between different networks. • Netgear-wndr4000-ddwrt-450 – Most Popular VPN Service Providers & DD-WRT Routers. [online image]. www.flashrouters.com, July 12, 2013.

How does a Router work? • A router receives data from the user. • Looks for the remote address of the other computer making routing decisions along the way • Forwards the user data out to a different interface that is closer to the remote computer

Diagram of a Router

Additional Information about Routers • Routers make sure data sent over the Internet goes where it needs to go and not where it is not needed. • Acts like a traffic controller, working to cut down congestion throughout the network and keeps everything flowing smoothly along the best path. • Routers are the only type of equipment that looks at every single packet passing by on the network. • Home network router including wireless routers can cost anywhere from $40 to $150 or higher.

What is a Bridge? • A hardware device used to create a connection between two separate computer networks or to divide one network into two. • Filters data traffic at a network boundary and reduces the amount of traffic on a LAN dividing it into two segments. • I -4E to Ethernet (10/100M) Network Bridge. [online image]. Network Bridge. Available at www.freewtc.com. July 12, 2013.

How does a Bridge work? • Each bridge consist of a MAC address and operates at layer 2 of the OSI model • When a packet is received on the bridge ports the forwarding table including the MAC address is automatically updated to map the source MAC address to the network port from which the packet originated • The gateway then process the received packet according to the packet’s type.

Diagram of a Bridge

Additional Information about Bridges • A bridge examines each message on a LAN and passes the ones known to be within the same LAN. • Computer addresses have no relationship to location in a bridging network. • A bridge is sometimes referred to as a brouter. • Wireless network bridges can costs anywhere from $100 to $1000 or more depending on the type of bridge purchased.

What is a Gateway? • A communication device that provides a remote network with connectivity to the host network. • Gateway Network Communications [online image]. Available www.hiwtc.com

How a Gateway Works • The gateway node acts like a proxy server and firewall • The gateway uses forwarding tables to determine where packet are to be sent

Gateway Diagram

Additional Information about Gateways • On the Internet a node or stopping point can be a gateway. • The computers controlling traffic within a network are gateway nodes. • A gateway is also associated with a router.

What is a Firewall? • Hardware or software device that protects a computer network from unauthorized access. • Firewall Sling Secure Smartphone. [online image]. Available www.slingsecure.com

How a Firewall works • Firewalls filters the information coming through the Internet connection into a user private network. • To control traffic in and out of the network firewalls one or more of the three methods are used including: • Packet filtering • Proxy service • Stateful inspection

Diagram of Firewall

Additional Information about Firewalls • Most home network routers have built in firewall. • The term “firewall” originated from firefighting, where a firewall is a barrier established to prevent the spread of a fire. • A firewall works with the proxy server making request on behalf of workstation users. • There are a number of features firewalls can include from logging and reporting to setting alarms of an attack. • Costs for host based firewalls usually costs around $100 or less. Some may costs more depending on different things such as features included or if its an enterprise based system.

What is a Wireless Access Point? • A small hardware device featuring built-in network adapter, antenna, and radio signals. • Configured nodes on a WLAN. • Wireless Access Points, Page 2. [online image]. Available compnetworking.about.com

How a Wireless Access Point works? • Operates using radio frequency technology • Broadcast wireless signals computers can detect and use • A wireless network adapter is implemented while using a wireless access point, most computers today already have network adapters built into the computer.

Diagram of Wireless Access Point RxNT – The eprescribing System. [online image]. Available www.rxnt.com

Additional Information about Access Points • The access point usually connects to the router • A hotspot is a application wireless users can connect to the Internet. • Aps are used throughout a home network, usually through only one AP. • Wireless access points can cost anywhere from $30 and up depending on the type purchased.

Websites Used • Searchsecurity.techtarget.com/definition • About.com • Howstuffworks.com • Windows.microsoft.com

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• Copy URL https://www.pbs.org/newshour/nation/watch-live-2024-pbs-national-memorial-day-concert

WATCH: 2024 PBS National Memorial Day Concert

This Sunday, PBS is broadcasting the 35th annual National Memorial Day Concert, hosted by Joe Mantegna and Gary Sinise.

Watch the event in the player above.

With all-star performances and tributes from Washington, D.C., the concert honors United States servicemen and women, military families, veterans and all those who have given their lives for the nation.

WATCH: Remembering and honoring the nation’s fallen on Memorial Day

The broadcast features celebrities sharing real-life stories spanning the history of U.S. military conflicts, tributes from award-winning musicians and performances from U.S. military choirs and ensembles.

The Chairman of the Joint Chiefs of Staff and the Joint Chiefs of Staff will also speak at the concert about the value military service and the challenges that veterans and their families face.

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