Dell Inspiron 11 3162

• Intel Celeron N3060 [Intel Celeron Processor N3060 (2M Cache, up to 2.48 GHz)]
• 2GB, 1600MHz, DDR3L
• 32GB eMMC Storage
• 11.6-inch HD (1366 x 768) Anti-Glare LED-Backlit Display [HDLCD]
• Windows 10 Home operating system
• 10 hours battery life, 1.22kg laptop
• Graphic card: Intel HD Graphics

• No Optical Device
• Anti Virus: McAfee Security Center 15 month subscription

Layer 4 Switch

Layer 4 switches operate at the transport layer of the TCP/IP stack. Layer 4 switches operate at the UDP and TCP level, making switching decisions based on information held in the transport layer

Layer 3 switch

Layer 3 switches combine the speed and cost-effectiveness of switching, with the control and scalability of routing. Like a router, a Layer 3 switch runs routing protocols such RIP, RIP2, OSPF or any other routing protocol. The Layer 3 switch communicates with all other "routers" in the network. From a router's perspective, it appears as if the Layer 3 switch is just another router exchanging information about topology and moving packets. 

Unlike traditional routers a Layer 3 switch applies switching technologies in the forwarding plane. The main CPU does not inspect packets unless they are exceptions

POP3 (Post Office Protocol 3)

POP3 is the most recent version of a standard protocol for receiving e-mail. POP3 is a client/server protocol in which e-mail is received and held for you by your Internet server. Periodically, you (or your client e-mail receiver) check your mail-box on the server and download any mail, probably using POP3.

Port number : 110

SMTP

Simple Mail Transfer Protocol, a protocol for sending e-mail messages between servers. Most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an e-mail client using either POP or IMAP. In addition, SMTP is generally used to send messages from a mail client to a mail server. This is why you need to specify both the POP or IMAP server and the SMTP server when you configure your e-mail application.

Port number: 25

Device manager

The Device Manager is a tool included with Microsoft Windows operating systems that allows the user to display and control the hardware attached to the computer. When a piece of hardware is not working, the offending hardware is highlighted where the user can deal with it.

Relay Agent

If we want to assign IP address automatically to other subnets then we need to require relay agent. DHCP server always uses broadcast traffic to assign IP address for the clients. But Router does not forward broadcast Packets. Router only broadcast unicast packets. To overcome this problem across subnets we are using DHCP Relay agent.

DNS

Domain Naming Service. It‘ll Resolve IP Address to Hostname (FQDN) and Hostname to IP address. In DNS there are two Zones.

1.   Forward Lookup Zone

2.   Reverse Lookup Zone.

FQDN – Fully Qualified Domain Name

DHCP (Dynamic Host Configuration Protocol)

Dynamic Host Configuration Protocol. It is used to Assign IP address automatically to the Client Machine.

          DHCP is a protocol used by networked computers (clients) to obtain IP addresses and other parameters such as the default gateway, subnet mask, and IP addresses of DNS servers from a DHCP server. It facilitates access to a network because these settings would otherwise have to be made manually for the client to participate in the network.

           DHCP operations fall into four basic phases. These phases are IP lease request, IP lease offer, IP lease selection, and IP lease acknowledgement

DHCP discovery

DHCP offers

DHCP requests

DHCP acknowledgement

Subnet Mask

Subnet mask is used for identify the Network.

Example:

For a class A address, a standard subnet mask is 255.0.0.0,

For a class B address, a standard subnet mask is 255.255.0.0,

For a class C address, a standard subnet mask is 255.255.255.0,

CMOS (Complementary Metal oxide Semiconductor)

A part of the motherboard that maintains system variables in static RAM. It also supplies a real-time clock that keeps track of the date, day and time. CMOS Setup is typically accessible by entering a specific sequence of keystrokes during the POST at system start-up.

What is Chatting?

Chatting is a Real Time Conversation between two or more people in the network.

HP 245 G5 Notebook PC

• AMD A6 APU 2.0Ghz with RadeonTM R4 Graphics.
• 4 GB DDR3L-1600Mhz RAM
• 500 GB SATA HDD (7200 rpm)
• 14" LED Screen
• DOS

Buy Online: http://amzn.to/2k8DJkN

Blue Screen Of Death

A Blue Screen error is mainly due to hardware or software incompatibility within the system. The most common reasons for a Blue Screen of Death (BSD) are unwanted software installation, high CPU usage and faulty RAM. Try the following options.

1. Pull out the RAM card, rub it with rubber on the chip side, and re-insert.

2. If a BSD still occurs, try using that RAM on another system.

3. Every BSD has a unique code; try searching it on Google to find a solution.

Operational roles for DC (Domain controller) and ADC ( Additional Domain Controller)

Operational roles for DC (Domain controller) are:

• Domain Naming Master
• Schema Master
• RID Master
• PDC Emulator
• Infrastructure Master

Operational roles for ADC (Additional Domain Controller) are:

• PDC Emulator
• RID Master
• Infrastructure Master