F5 101 Application Delivery Fundamentals-Study Notes-OSI Layer

Explain, compare, and contrast the OSI layers http://www.tcpipguide.com/free/t_OSIReferenceModelLayers.htm  7 – Application Interacts with the user (FTP/HTTP/SMB/SSH/etc.) 6 – Presentation Converts information into data structures that are understandable by/useful to the system (XML/TLV/JSON) SSL/WEP/WPA 5 – Session Allows two endpoints to exchange data for a period of time. NetBIOS, TCP/IP Sockets, RPCs Not necessarily the length [...]

What is Cisco ISE (Identity Services Engine)

Today’s enterprise network is rapidly changing, especially when it comes to employee mobility. Employees are no longer tethered to desktop workstations, but instead access enterprise resources via a variety of devices: tablets, smartphones, and personal laptops, just to name a few. Being able to access resources from anywhere greatly increases productivity, but it also increases [...]

A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen?

The Data Link layer provides the physical transmission of the data and handles error notification, network topology, and flow control. The Data Link layer formats the message into pieces, each called a data frame, and adds a customized header containing the hardware destination and source address. Protocols Data Unit (PDU) on Datalink layer is called [...]

Hardware terms

Bandwidth Bandwidth refers to the amount of information that can be transmitted over a network in a given amount of time, usually expressed in bits per second or bps Protocol Protocols are the set of rules / algorithm used to learn routes, so that network traffic can be passed from a source to the destination. [...]

What is metro ethernet?

A metropolitan-area Ethernet, Ethernet MAN, or metro Ethernet network is a metropolitan area network (MAN) that is based on Ethernet standards. It is commonly used to connect subscribers to a larger service network or the Internet. Businesses can also use metropolitan-area Ethernet to connect their own offices to each other. An Ethernet interface is much [...]

How HTTP protocol works?

HTTP functions as a request–response protocol in the client–server computing model. A web browser, for example, may be the client and an application running on a computer hosting a web site may be the server. The client submits an HTTP request message to the server. The server, which provides resources such as HTML files and [...]


A • AAL: ATM Adaptation Layer • ABM: Asynchronous Balance Mode • ABR: Available Bit Rate • AC: Access Control • ACK: Acknowledgment • ADSL: Asymmetric Digital Subscriber Links • ANI: Automatic Number Identification • ANSI: American National Standards Institute • API: Application Programming Interface • ARM: Asynchronous Response Mode • ARP: Address Resolution Protocol [...]

How ARP works?

ARP stands for Address Resolution Protocol. When you try to ping an IP address on your local network, say, your system has to turn the IP address into a MAC address. This involves using ARP to resolve the address, hence its name. Systems keep an ARP look-up table where they store information about [...]