• vSphere 6.0 released compared as previous versions of vSphere 5.0 instead of most advanced features and improvements available.
• The difference between vSphere 5.0, 5.1, 5.5 and vSphere 6.0,

• ESXi – is a type 1 hypervisor. A hypervisor is a part of software that creates and runs virtual machines. In vSphere, virtual machines are installed on ESXi servers.
• vCenter Server – is a centralized management platform and framework that lets you manage virtual machines and ESXi hosts centrally.
• vSphere Update Manager – An add-on package for vCenter Server that helps you keep your ESXi hosts and VMs patched with the latest updates.
• vSphere Web Client – is a web-based user interface used for handling a virtual infrastructure.
• vSphere Client – Windows application a locally installed with a graphical user interface (GUI) everyday handling tasks and virtual infrastructure to be advanced configuration.

• VMware vSphere or Microsoft Hyper-V is a software layer implemented by hypervisors. But hypervisors can also be implemented as code embedded in a system’s firmware.
• There are two principal types of hypervisor.

• These hypervisors run on the host’s hardware to manage guest operating systems and to control the hardware.
• For this purpose, it is called as bare-metal hypervisors.

• These hypervisors run on the operating system (OS) just as other computer programs do.
• In the host runs the guest operating system. Type-2 hypervisors abstract guest operating systems from the host operating system

• Hypervisor is a program the multiple operating systems to share a single hardware host.
• The host’s processor, memory and other resource by each operating system.
• Each operating system has the resource, host’s processor and required allocating controls by Hypervisor. Guest operating system and OS cannot be disturbed each other.
• The host machine hardware allows to work one or more virtual machines as guests has independently, the multiple guest VMs allowing to share the system’s physical compute resources, processor cycles, memory space, network bandwidth by effectively.
• A hypervisor is another name called as virtual machine monitor.

• It is the Web-based application that connects users to the vCenter Server to manage installations and handle inventory objects in a vSphere environment.
• An object navigator, the main workspace, and the tasks and alarms panel is the features of graphical user interface (GUI) presents by the Web Client.
• Through this GUI, the objects listed in the virtualized data center can be manage and supervise by the vSphere administrator.
• Java server comprised the Web Client and an application based on Adobe Flex that runs in a browser.
• VCenter Server through a Web browser access by user using vSphere Web Client.
• The intermediate communication between the browser and the vCenter Server by using VMware API in vSphere Web Client.

• In a cluster or single host resource pools are partition of computing and memory resources.
• Resource pool are hierarchical and nested. Further divide and assign to different groups or different purpose from any resource pool can be partition into smaller resources.
• Allocated to virtual machine in a VMware virtual infrastructure the resource pool aggregated to physical computer hardware — CPU and memory as well as other component.
• Physical resource for virtual system are manage and optimizes used by VMware Distributed Resource Scheduler(DRS) cluster.
• One resource pool changes will occur not affect other, unrelated resource pools created by VMware administrators.
• Resource pool or virtual machine are not being used reserved resource. They can be shared.

• VSphere DRS (Distributed Resource Scheduler) is a utility an available resources in a virtualized environment. While computing the workload should be balanced.
• The utility is one of the part in virtualization suite called as VMware Infrastructure 3.
• It is an often used in conjunction with vSphere HA to rebalance workloads that must be restarted on alternate hosts.
• An organization uses vSphere DRS and vSphere HA combine together then restarted the VMs do not affect the performance of other VMs on the failover host.
• vSphere DRS can migrate VMs from overutilized ESXi hosts to underutilized hosts while DRS become an unbalanced.
• Using vMotion in a vSphere DRS performs migrations of VMs across hosts in the cluster without any downtime.

• VMware fault tolerance of VMware vSphere is an chief component, and it offers preventing data loss to the continuous accessibility the applications and down time of virtual machines in the event of ESX server failure.
• Fault Tolerance is enabled by virtual machine, a secondary copy of the original (or primary) virtual machine is created.
• When all actions completed on the primary virtual machine are also applied to the secondary virtual machine.
• The secondary machine becomes active. When the primary virtual machine becomes unavailable. Secondary machine are providing continual availability.

• VMware vSphere HA (High Availability) is a utility on alternative host servers to reduce application downtime. While VMware’s vSphere software that can restart failed in virtual machines (VMs).
• Server administrator enables by vSphere HA to pool physical servers on the same network into a logical group called a high availability cluster.
• System crash, power interruption or network failure server failure will occur. VSphere HA detects which VMs are down and restarts them on another stable system within the cluster.
• Workloads will failed while restarting on secondary systems is called failover.

• The VMware’s suite of server virtualization products is brand name to the VMware vSphere that includes its ESXi hypervisor and vCenter management software.
• VMware VSphere is formerly called as VMware Infrastructure.
• VSphere updates to add features, modification to an application program interface(API) and changes to ESXi shell.
• VMware vSphere is the power of virtualization datacenters into simplified cloud infrastructure to be transformed. It is also used enables to deliver is flexible of IT organization and IT service should be reliable.
• VMware VSphere is manages of infrastructure as large collections (such as CPUs, storage and networking) in cloud operating system. It is a dynamic operating environment. It is also manages complexity of datacenter.

• UDP vs TCP – TCP/IP means Transmission Control Protocol and Internet Protocol. It is the network model used in the current Internet architecture as well.
• Protocols are set of rules which govern every possible communication over a network.
• These protocols describe the movement of data between the source and destination or the internet. They also offer simple naming and addressing schemes.

• Support for a flexible architecture. Adding more machines to a network was easy.
• The network was robust, and connections remained intact until the source and destination machines were functioning.

• Lowest layer of the all.
• Protocol is used to connect to the host, so that the packets can be sent over it. Varies from host to host and network to network.

• Selection of a packet switching network which is based on a connectionless internetwork layer is called a internet layer. This layer which holds the whole architecture together.
• It helps the packet to travel independently to the destination.
• Order in which packets are received is different from the way they are sent.
• IP (Internet Protocol) is used in this layer.

• Delivering IP packets.
• Performing routing.
• Avoiding congestion.

• It decides if data transmission should be on parallel path or single path.
• Functions such as multiplexing, segmenting or splitting on the data is done by transport layer.
• The applications can read and write to the transport layer.
• Transport layer adds header information to the data.
• Transport layer breaks the message (data) into small units so that they are handled more efficiently by the network layer.
• Transport layer also arrange the packets to be sent, in sequence.

• The TCP/IP specifications described a lot of applications that were at the top of the protocol stack. Some of them were TELNET, FTP, SMTP, DNS etc.
  • TELNET is a two-way communication protocol which allows connecting to a remote machine and run applications on it.
  • FTP (File Transfer Protocol) is a protocol, that allows File transfer amongst computer users connected over a network. It is reliable, simple and efficient.
  • SMTP (Simple Mail Transport Protocol) is a protocol, which is used to transport electronic mail between a source and destination, directed via a route.
  • DNS (Domain Name Server) resolves an IP address into a textual address for Hosts connected over a network.
• It allows peer entities to carry conversation.
• It defines two end-to-end protocols : TCP and UDP
  • TCP (Transmission Control Protocol) : It is a reliable connection-oriented protocol which handles byte-stream from source to destination without error and flow control.
  • UDP (User-Datagram Protocol) : It is an unreliable connection-less protocol that do not want TCPs, sequencing and flow control. For Example One-shot request-reply kind of service.

• It operated independently.
• It is scalable.
• Client/server architecture.
• Supports a number of routing protocols.
• Can be used to establish a connection between two computers.

• In this layer does not guarantee delivery of packets.
• The model cannot be used in any other application.
• Replacing protocol is not easy.
• It has not clearly separated its services, interfaces and protocols.

• Switching is the most valuable asset of computer networking.
• Everytime in computer network you have access the internet or another computer network outside your immediate location, or your messages are sent through a maze of transmission media and connection devices.
• The mechanism for exchange of information between different computer networks and network segments is called switching in Networking.
• On the other words we can say that any type signal or data element directing or Switching toward a particular hardware address or hardware pieces.
• Hardware devices that can be used for switching or transferring data from one location to another that can use multiple layers of the Open Systems Interconnection (OSI) model.

• There are basically three types of switching methods are available.
  • Circuit Switching
  • Packet Switching
  • Message Switching

• Circuit-switching is the real-time connection-oriented system. In Circuit Switching a dedicated channel (or circuit) is set up for a single connection between the sender and recipient during the communication session.
• In telephone communication system, the normal voice call is the example of Circuit Switching. The telephone service provider maintain a unbroken link for each telephone call.
• Circuit switching is pass through three phases, that are circuit establishment, data transfer and circuit disconnect.

• The basic example of Packet Switching is the Internet. In Packet Switching, data can be fragmented into suitably-sized pieces in variable length or blocks that are called packets that can be routed independently by network devices based on the destination address contained certain “formatted” header within each packet.
• The packet switched networks allow sender and recipient without reserving the circuit. Multiple paths are exist between sender and recipient in a packet switching network.
• They does not require a call setup to transfer packets between sender and recipient.

• There are two type of Packet Switching connectionless or Connection-Oriented.

• It is also known as datagram switching. In this type of network each packet routed individually by network devices based on the destination address contained within each packet.
• Due to each packet is routed individually, the result is that each packet is delivered out-of-order with different paths of transmission, it depend on the networking devices like (switches and routers) at any given time.
• After reaching recipient location, the packets are reassemble to the original form.

• It is also known as virtual circuit switching. In this type of Networking packets are send in sequential order over a defined route.

• Message switching does not set up a dedicated channel (or circuit) between the sender and recipient during the communication session.
• In Message Switching each message is treated as an independent blocks.
• In this type of networking, each message is then transmitted from first network device to second network device through the internetwork i.e. message is transmitted from the sender to intermediate device.

• The intermediate device stores the message for a time being, after inspects it for errors, intermediate device transmitting the message to the next node with its routing information. Because the message switching networks are called store and forward networks in networking.

• Routing refers to establishing the routes that data packets take on their way to a particular destination.
• This term can be applied to data traveling on the Internet, over 3G or 4G networks, or over similar networks used for telecom and other digital communications setups. Routing can also take place within proprietary networks.

• Every network Routing protocol performs three basic functions:
  • Discovery – Identify other routers on the network.
  • Route Management – Keep track of all the possible destinations (for network messages) along with some data describing the pathway of each.
  • Path Determination – Make dynamic decisions for where to send each network message.

• Static Routing is a process in which we have to manually add routes in Routing table.

• No Routing overhead for router CPU which means a cheaper router can be used to do Routing.
• It adds security because only administrator can allow Routing to particular networks only.
• No bandwidth usage between routers.

• For a large network, it is a difficult task for administrator to manually add each route for the network in the Routing table on each router.
• The administrator should have good knowledge of the topology.
• If a new administrator comes, then he has to manually add each route so he should have very good knowledge of the routes of the topology.

• This method where the router is configured to send all packets towards a single router (next hop).
• It is very useful method for small networks or networks with a single entry and exit point.
• Basically this method used in addition to Static and/or Dynamic routing.
• It is generally used with stub routers. A stub router is a router which has only one route to reach all other networks.

• • Dynamic Routing makes automatic adjustment of the routes according to the current state of the route in the Routing table.
  • Dynamic Routing uses protocols to discover network destinations and the routes to reach it.
  • RIP and OSPF are the best examples of dynamic Routing protocol. Automatic adjustment will be made to reach the network destination if one route goes down.

Dynamic Routing

• A dynamic protocol have following features,
  • The routers should have the same dynamic protocol running in order to exchange routes.
  • When a router finds a change in the topology then router advertises it to all other routers.

• Easy to configure.
• More effective at selecting the best route to a destination remote network and also for discovering remote network.

• Consumes more bandwidth for communicating with other neighbours.
• Less secure than static Routing.

• An optical network is a type of data communication network built with optical fiber technology.
• It utilizes optical fiber cables as the primary communication medium for converting data and passing data as light pulses between sender and receiver nodes.
• An optical network is also known as an optical fiber network, fiber optic network or photonic network.

• There are various types of optical networking

• • Passive Optical Network
  • Active Optical Network
  • Synchronous Optical Network
  • Star networking

• This type of optical networking in which only single stand of fiber optics can take part and build a connection between the multiple computer networking clients from different areas is called as the passive optical networking.
• But some times customers complained that it can lower the rate of internet connection.

• Active optical network relies on electrically powered network equipment to distribute the signal, such as a switch or router.
• Usually, the data need optical-electrical-optical transformation in the Active optical network.
• Each signal leaving the central office is directed only to the customer for whom it is intended.

• This type of optical networking that deals with the data transmission is the synchronous optical networking.
• In this case optical networks can screen that all the data related to the information can pass easily from one place to another.
• It is more effective then the physical networking. It also observes the type of data; the type of data should be of one form and can be relayed properly.

• Networking carried out with the help of star networks is called as the star networking.
• Star networks deals with connection between the main computer systems to the other multiple computers over the network.
• They are also able to enhance the performance of the connection’s an the network.

• The optical networking depends upon the different components used in the optical networks such as the fiber optical cables.
• In optical networking with the help of fiber optics user scan deliver the date between two points at higher speed with similar to that of the light.
• Core is the main source of transmission in the optical networking. These cores are packed in a special type of layer which maintains the light signals in it. This wrapping also prevents the light to move outward from the cores of fiber optics.
• This step really prevents the data losing during transmission. According to this optical networks works on large distances and facilitate the users at long areas.

• Optical networks have three important attributes:
  • speed,
  • range,
  • capacity.
• Optical networking reduces latency between endpoints on the network. Where an electric current moves data at about 10% of the speed of light around 18,600 miles per second or 30,000 kilometers per second optical signals in fiber optic cable travel 10 times faster, at the speed of light 186,000 miles per second or 300,000 kilometers per second.
• Optical networks can also move more data across a cable at longer distances: Using electronics and copper, speeds top out at around 100 Gbps over short distances.
• Fiber can move data at 100 Gbps over a single data channel and across multi-kilometer distances and even further with amplification.
• Even greater speeds can be obtained by dividing a single optical cable into multiple data channels.

• Authorization is a security mechanism to determine access levels or user/client privileges related to system resources.
• Including files, services, computer programs, data and application features.
• This is the process of granting or denying access to a network resource which allows the user access to various resources based on the user’s identity.
• There are two types of authorization
  • Server-side Authorization
  • Client-side Authorization

• The server has three authorization modes. Depending on the authorization mode we choose, the server will decide if it accepts or declines an incoming invocation.

• This is the simplest type of authorization. No authorization will be performed.

• A client will be allowed to use a grid service if the client’s identity is the same as the service’s identity.

• A gridmap is a list of ‘authorized users’ akin to an ACL (Access Control List).
• When this type of authorization is used, only the users that are listed in the service’s gridmap may invoke it.

• This allows the client to figure out when it will allow a grid service to be invoked.
• This might seem like an odd type of authorization, since authorization is generally seen from the server’s perspective (“Do I allow client FOO to connect to grid service BAR?”).
• However, in GSI, clients have every right to be picky about the services they can access.

• No authorization will be performed.

• The client will authorize an invocation if the service’s identity is the same as the client.
• If we use both client-side and server-side Self authorization, a service can be invoked if and only if its identity matches the client’s.

• The client will authorize an invocation if the host returns an identity containing the hostname.
• This is done using host certificates.

A port has the following characteristics −

• External devices are connected to a computer using cables and ports.
• Ports are slots on the motherboard into which a cable of external device is plugged in.
• Examples of external devices attached via ports are the mouse, keyboard, monitor, microphone, speakers, etc.

• A port number is the logical address of each application or process that uses a network or the Internet to communicate.
• A port number uniquely identifies a network-based application on a computer.
• Each application/program is allocated a 16-bit integer port number.
• This number is assigned automatically by the OS, manually by the user or is set as a default for some popular applications.

• Protocol is a special set of rules for communication data.
• Network protocol = Rules and conventions/conditions for communication between network devices.
• Network protocols defines the mechanism of devices to identify and establish the connections between each other + formatting rules that specify how data is packaged into messages sent and received.

• A Media Access Control (MAC) address is a 48-bit address stored in the network Interface card.
• It is used for communication between two hosts in an Ethernet environment.
• It is nothing but a hardware /physical address of a computer.
• A MAC address is supposed to be globally unique and this will not be duplicated.
• The 48 bit contains – First 24 bits ( User ID -> Card Buyer ID ) + second 24 bits (card manufacturer)
• The address is written in the form of 12 hexadecimal digits. For example, consider the following MAC address:
  • D8-D3-85-EB-12-E3

• Every hexadecimal character represents 4 bits, so the first six hexadecimal characters represent the vendor (in this case, Hewlett Packard).

• Four levels of addresses are used in an internet employing the TCP/IP protocols:
  • Physical Addresses
  • Logical Addresses
  • Port Addresses
  • Specific Addresses

• Click the Network Icon on Taskbar
• Click the connected network and click the properties which are shown in the figure

• The network setting window open and shows the mac address.

• Open command prompt and type getmac to get the mac address

• Navigate to Control Panel > Network and Internet > Network Connections
• Right click the connection and click status within the dropdown

• Click Details buttons in the status window
• Then the Network Details windows open and shows the MAC address(Physical address)

• Open command prompt and type ipconfig /all (have a gap between g and /).

• Spoofing is that the act of disguising a communication from an unknown resource as being from a well-known, trusted resource.
• Spoofing will apply to emails, phone calls, and websites, or will be a lot of technical, like a pc spoofing an IP address, Address Resolution Protocol (ARP), or Domain name System (DNS) server.
• Spoofing will be used to gain access to a target’s personal information, describe malware through infected links or attachments, bypass network access controls, or distribute traffic to conduct a denial-of-service attack.
• Spoofing is usually the means a vulgar actor gains access so as to execute a bigger cyber attack like a complicated persistent threat or a man-in-the-middle attack.
• Successful attacks on organizations will cause infected pc systems and networks, data breaches, and/or loss of revenue-all vulnerable to have an effect on the organization’s public reputation.
• Additionally, spoofing that ends up in the rerouting of web traffic will overwhelm networks or lead customers/clients to malicious sites aimed at stealing info or distributing malware.

• Email spoofing is that the fake of an email header so the message seems to have originated from somebody or somewhere apart from the particular source.
• Email spoofing may be a plan of action utilized in phishing and spam campaigns because people are more likely to open an email after they assume it’s been sent by a legitimate source.
• The goal of email spoofing is to need recipients to open, and probably even answer, a solicitation.

• IP (Internet Protocol) forms the third layer of the ISO model. It is the network protocol which is used for the transmission of messages over the internet. Every email message sent has details in the message header of the IP address of the sender (source address). Hackers and scammers alter the header details to mask their true identity by editing the source address. The emails then look to have been transmitted by a trusted source. There are two types of IP spoofing.
  • Man in the Middle Attacks
  • Denial of Service (DoS) Attacks

• Caller ID spoofing is when a caller with intent fakes the information transmitted to your caller ID display to disguise their identity.
• Spoofing is often used as part of an attempt to trick someone into giving away valuable personal information so it can be used in fraudulent activity or sold illegally, but also can be used legitimately, for example, to display the toll-free number for a business.

• ARP poison routing (APR) or ARP cache poisoning, a method of attacking an Ethernet LAN by updating the target computer’s.
• ARP cache with both a fake ARP request and reply packets in an effort to change the Layer 2 Ethernet MAC address (i.e., the address of the network card) to one that the attacker can monitor.
• Because the ARP replies have been fake, the target computer sends frames that were meant for the original destination to the attacker’s computer first so the frames can be read.
• A successful APR attempt is invisible to the user.

• DNS (Domain Name System) servers resolve URLs and email addresses to corresponding IP addresses.
• DNS spoofing allows attackers to distract traffic to a different IP address, leading victims to sites that extent malware.

• Website spoofing means when a website is designed to copycat an existing site known and/or trusted by the user.
• Attackers use these sites to gain login and other personal information from users.