CCNA CERTIFICATION FOR DUMMIES PDF
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A complete preparation guide for the entry-level networking CCNA certification. If you're planning to advance your career by taking the all-important Cisco. Editorial Reviews. From the Back Cover. Pass your CCNA exam and boost your career — here's just what you need! The demand for Cisco Certified Network. the CCNA Exam Whats included in CCNA certification? ..
Cisco Networking All-in-One For Dummies
With this record as your consultant, you are going to assessment issues on options and instructions that follow to this examination. For example, MIME is a Layer 6 protocol that is used by e-mail software programs and Web browsers Layer 6 applications to convert e-mail contents that are not text into a data format that can be viewed, rendered, or otherwise processed on the computer host.
Multipurpose Internet Mail Extensions are used to allow e-mail applications to convert e-mail message contents other than text into a data format that is supported on the receiving host.
On the other hand, more than one network application may be running on each host. For example, you can have an e-mail program and a Web browser open at the same time on your host.
So, how does your Web browser connect to a Web server, considering that the Web server host has only one IP address and may also be running an e-mail server application? All traffic flows through the central device.
The star topology is also known as a hub-and-spoke topology. Permissions Request permission to reuse content from this site. Table of contents Introduction. Book I: Networking Basics.
Chapter 1: Introducing Computer Networks. Chapter 2: Chapter 3: Chapter 4: Data Encapsulation. Chapter 5: Binary, Hexadecimal, and Decimal Numbering Systems. Chapter 6: Chapter 7: Chapter 8: Introducing Wireless Networks.
Chapter 9: Network Design.
The ARP or Address Resolution Protocol is responsible for the resolution of the Internet layer address to the Network Interface layer address such as a hardware address. The image below shows the format of an IP address. It is responsible for providing the Application layer with session and datagram communication services.
TCP is responsible for the sequencing, and acknowledgment of a packet sent. It also does the recovery of packet lost during transmission. Packet delivery through TCP is more safe and guaranteed. UDP is used when the amount of data to be transferred is small. It does not guarantee packet delivery.
Network Segmentation Network segmentation implicates splitting the network into smaller networks. It helps to split the traffic loads and improve the speed of the Internet.
Network Segmentation can be achieved by following ways, By implementing DMZ demilitarised zones and gateways between networks or system with different security requirements. By implementing DSD evaluated cross-domain solutions where necessary Why Network Segmentation is important Network Segmentation is important for following reasons, Improve Security- To protect against malicious cyber attacks that can compromise your network usability.
To detect and respond to an unknown intrusion in the network Isolate network problem- Provide a quick way to isolate a compromised device from the rest of your network in case of intrusion.
Segmentation is done based on the factors such as project team, function or application, irrespective of the physical location of the user or device. A group of devices connected in a VLAN act as if they are on their own independent network, even if they share a common infrastructure with other VLANs.
The popular device used for segmenting are a switch, router, bridge, etc. Subnetting Subnets are more concerned about IP addresses.
Subnetting is primarily a hardware-based, unlike VLAN, which is software based.
CCNA Certification All-In-One for Dummies [PDF] Full Ebook
A subnet is a group of IP address. It can reach any address without using any routing device if they belong to the same subnet.
Few things to consider while doing network segmentation Proper user authentication to access the secure network segment ACL or Access lists should be properly configured Access audit logs Anything that compromises the secure network segment should be checked- packets, devices, users, application, and protocols Keep watch on incoming and outgoing traffic Security policies based on user identity or application to ascertain who has access to what data, and not based on ports, IP addresses, and protocols Do not allow the exit of cardholder data to another network segment outside of PCI DSS scope.
Packet Delivery Process So far we have seen different protocols, segmentation, various communication layers, etc. Now we are going to see how the packet is delivered across the network.
The process of delivering data from one host to another depends on whether or not the sending and receiving hosts are in the same domain. A packet can be delivered in two ways, A packet destined for a remote system on a different network A packet destined for a system on the same local network If the receiving and sending devices are connected to the same broadcast domain, data can be exchanged using a switch and MAC addresses.
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But if the sending and receiving devices are connected to a different broadcast domain, then the use of IP addresses and the router is required. Suppose host A wants to send a packet to host B.
Since at layer 2 packets are sent with MAC address as the source and destination addresses.
Intrasegment packet routing If a packet is destined for a system on the same local network, which means if the destination node are on the same network segment of the sending node. The sending node addresses the packet in the following way. The node number of the destination node is placed in the MAC header destination address field.
The node number of the sending node is placed in the MAC header source address field The full IPX address of the destination node is placed in the IPX header destination address fields.Subnetting is primarily a hardware-based, unlike VLAN, which is software based.
In other words, don't think that just because you are reading the official Cisco press CCNA study guides, you are dealing with a set of information that is as close as possible to the set of information from which the test was drawn.
It is becoming the more common way to connect network as they are simply faster and more intelligent than bridges. It is used to connect devices to a LAN.
If you've been involved in networking for a while or you've studied for the CCNA before like me , taking these quizzes can keep you from wasting time reading about things you already know. Many multiple-choice questions count correct answers wrong and vice versa and some of these are taken directly from the books, which usually give the correct answer. Technically it is referred as You can read the free books or free online Books linkS I provide to study.
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