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level: IT Inventory

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level questions: IT Inventory

QuestionAnswer
Layer 2 vs Layer 3Layer 2 and Layer 3 differ mainly in the routing function. A Layer 2 switch works with MAC addresses only and does not care about IP addresses or any items of higher layers. Layer 3 switch, or multilayer switch, can do all the job of a layer 2 switch and additional static and dynamic routing. That means, a Layer 3 switch has both a MAC address table and an IP routing table and handles intra-VLAN communication and packet routing between different VLANs.
Hypervisor Type 1Native or bare-metal hypervisors These hypervisors run directly on the host's hardware to control the hardware and to manage guest operating systems. For this reason, they are sometimes called bare-metal hypervisors.
Hypervisor Type 2These hypervisors run on a conventional operating system (OS) just as other computer programs do. A virtual machine monitor runs as a process on the host. Type-2 hypervisors abstract guest operating systems from the host operating system.
Hypervisora software that you can use to run multiple virtual machines on a single physical machine
Hypervisor ImageHypervisor Image
Hyper-V Hostthe physical computer that provides the resources, including processing power, memory and disc usage for your virtual machines
VMwarea computer software program that allows you to install a virtual operating system within any operating system
Virtual Servera software-based representation of a physical server. The function that abstracts CPU, memory, storage and network resources from the underlying hardware and assigns them to VMs is called a hypervisor
Backup Softwarea computer program that makes a copy of your files and folders or your complete system, including the operating system, applications and data. Advanced applications allow you to make multiple backups so that if one backup is damaged or unavailable, you have another with which to recover your data and/or systems.
SANA Storage Area Network (SAN) is a specialized, high-speed network that provides block-level network access to storage
Difference between SAN and Cloud storageThe difference between storage area networks and cloud storage is that SAN systems are hosted through a company's own servers, while the cloud stores it virtually via internet servers
SAN ImageSAN Image
NASNetwork-attached storage (NAS) devices store and share data for multiple computers, that can be accessed remotely.
DASDirect-attached storage (DAS) is a type of storage that is attached directly to a computer without going through a network.
SAN vs NAS vs DAS imageSAN vs NAS vs DAS image
NAS vs SAN imageNAS vs SAN image
NAS vs SAN setup imageNAS vs SAN setup image
What is a Tape Librarya collection of magnetic tape cartridges and tape drives
What does a Tape Library do?Tape libraries and autoloaders automate backups and archives with multiple tapes. Tape libraries offer more capabilities than autoloaders, but are often far more expensive, as well as more complex because they have more tape drives. A tape autoloader is a step up from a single tape drive for backup and archiving.
SwitchA network switch forwards data packets between devices. Switches send packets directly to devices, rather than sending them to networks like a router does.
Layer-3 Switches/RoutersA Layer 3 switch functions as both a switch and a router.
VLANVirtual Local Network (VLAN) is a subnetwork that takes groups of devices on a larger network and creates a virtual LAN for those devices, effectively separating them from the other devices on the network. This achieves the same ends as WLANs are able to achieve naturally through the use of separate channels and lends a LAN much more flexibility.
WLANA wireless local area network can be considered a subcategory of regular local area networks. By definition, in order to be within range of a wireless access point, a device must be local to that access point. Wireless networks differ, though, in that they use the air as a shared hub through which they transmit data as opposed to discrete cabling. We know this, of course, as WiFi.
LANA Local Area Network (LAN) is a network of devices connected across short distances, all located within a single, defined area. For example, this could be the network within a household or a business, or even cover an area as diverse as a college campus.
WANWide Area Network (WAN) connects multiple smaller networks over larger distances. This opens up a vast range of new opportunities for computers to share data and information.
VPNVirtual Private Network (VPN) offers a unique combination of privacy and remote access. When you use a VPN, you can send and receive data as if you were a part of a private network, even though you are doing so from a different location.
2 VPN PrincipalsFirst, for businesses that need to provide secure access to their private network to staff working remotely. Second, users can effectively create a virtual network, ‘become’ a part of it and appear to the wider internet as part of that virtual network. This creates a method of masking your identity and true IP address/location when you’re interacting with public networks. This offers tremendous value in terms of privacy and internet security.
MANMetropolitan Area Network connects different organizations
LAN vs MAN vs WAN imageLAN vs MAN vs WAN image
Layer 2 switcha traditional network switch port that operates in the network data link layer or the "layer 2" of the OSI model of network connection. Purely operating within the network's hardware layer, these switches forward data packets based on the MAC addresses specified.
Layer 2 vs Layer 3Layer 2 and Layer 3 differ mainly in the routing function. A Layer 2 switch works with MAC addresses only and does not care about IP addresses or any items of higher layers. Layer 3 switch, or multilayer switch, can do all the job of a layer 2 switch and additional static and dynamic routing. That means, a Layer 3 switch has both a MAC address table and an IP routing table and handles intra-VLAN communication and packet routing between different VLANs.
Access Pointsa device that creates a wireless local area network, or WLAN, usually in an office or large building. An access point connects to a wired router, switch, or hub via an Ethernet cable, and projects a Wi-Fi signal to a designated area.
Load Balancersacts as the “traffic cop” sitting in front of your servers and routing client requests across all servers capable of fulfilling those requests in a manner that maximizes speed and capacity utilization and ensures that no one server is overworked, which could degrade performance.
Point to Point connectionsa private data connection securely connecting two or more locations for private data services. A point to point connection is a closed network data transport service which does not traverse the public Internet and is inherently secure with no data encryption needed.
UPSuninterruptible power supply, is equipped with battery backups that kick in during a power failure, keeping your network equipment running smoothly. This protects your equipment from damage and ensures you don't lose any unsaved work.