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  Powerful Wireshark Filters ip.addr == x.x.x.x ip.src == x.x.x.x ip.dst == x.x.x.x ip.addr == x.x.x.x && ip.addr == x.x.x.x  ip.src == xxxx && ip.dst == xxxx http or dns tcp.port==xxx udp.port==xxx tcp.srcport==80 && tcp.dstport==80 tcp contains xxx e.g.   tcp contains google http.request tcp.port eq 25 or icmp

  A port is a virtual point where network connections start and end.  Ports are software-based and managed by a computer's operating system .  A port is associated with a specific process or service (Internet Browsing, Email, VoIP etc.) Ports allow a single host  with a single IP address to run network services.  Each port number identifies a distinct service . Each host can have 65535 ports per IP address.  Ports are regulated by the Internet Corporation for Assigning Names and Numbers ( ICANN ).  By ICANN there are three categories for ports: From 0 to 1023 – well known ports assigned to common protocols and services From 1024 to 49151 – registered ports assigned by ICANN to a specific service From 49152 to 65 535 – dynamic (private, high) ports range from 49,152 to 65,535. Ports can be used by any service on an ad hoc basis .  Ports are assigned when a session is  established , and released when the session ends. ...

TCP/IP and OSI are the 2 most widely used networking models for communication.  OSI is a conceptual model which is not practically used for communication. TCP/IP is used for establishing a connection and communicating through the network. OSI model mainly emphasis on the services, interfaces and protocols . TCP model is not able to distinctly describe the above concepts. TCP/IP enables  Only connectionless ( UDP ) communication mode in the network layer . Connectionless ( UDP ) and connection-oriented ( TCP ) in the transport layer . OSI model enables Supports UDP and TCP communication over the network layer . In Transport layer, TCP communication is merely allowed.

  What is a monoclonal antibody and how does it work? The body’s immune system generates antibodies — specific protein molecules — as a defense mechanism against unfamiliar molecules, called antigens. Molecules from pathogens like bacteria and viruses can act as antigens, prompting the production of antibodies that bind to antigens. This tells specialized cells of the immune system to kill the invading pathogen. Monoclonal antibodies work specifically against a particular portion on an antigen called the epitope, thereby exerting very targeted action. The Role of Antigens & Antibodies in Vaccinations Vaccines contain antigens which stimulate the B lymphocytes of the immune system to respond by producing plasma cells which secrete disease specific antibodies. Some of the B cells become memory B cells , which will recognize future exposure to the disease. This results in a faster and more intense production of antibodies, which effectively work to eliminate t...

  Antibody tests are useful to help track the spread of a contagious disease , disease that is readily spread. It can be very useful to identify those who should be vaccinated urgently, and to select the donors for convalescent plasma therapy. Antigens are molecules capable of stimulating or encouraging an immune system response. Each antigen has distinct surface features or structures called epitopes, generating specific responses. What are Antibody and Antigen ? An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shaped protein used by the immune system to identify and remove foreign objects such as pathogenic bacteria and viruses.  These antibodies are produced by B cells of the immune system due to exposure to antigens. Each antibody contains a paratope which recognizes a specific 'epitope' on an antigen, acting like a lock and key binding mechanism. This binding makes possible to eliminate antigens from the body, either by direct neutralization or by ‘ta...

  Portable Pulse Oximeter Portable Pulse Oximeter is a noninvasive and painless device to measures oxygen saturation level, or the oxygen levels in blood. It can rapidly detect even small changes in how efficiently oxygen is being carried  to all of its cells, tissues, and organs. Portable Pulse Oximeter can be used to measure oxygen saturation levels along with heart rate. Portable Pulse oximeter can be used to monitor the health of a person with any type of condition that can affect blood oxygen levels. These conditions include: 1 . chronic obstructive pulmonary disease 2 . asthma 3 . pneumonia 4 . lung cancer 5 . anemia 6 . heart attack or heart failure 7 . congenital heart defects How Portable Oximeter Works To measure oxygen level, a probe that looks like a bag clip is placed onto fingertip, toe, or earlobe. Light beams pass through the blood, measuring the amount of oxygen gas. It does this by measuring changes of light absorption in oxygenated blood containing high...

There are three types of settings: Home Page Tags Archive and Search Page Tags Post and Page Tags Step - 1 Click Settings in  Blogger.com   =>   Crawler and Indexing Section  =>  Click Home Page Tags Select these Options:   Step - 2 Click Settings in  Blogger.com   =>   Crawler and Indexing Section  =>  Click Archive and Search Page Tags Select these Options: Step - 3 Click Settings in  Blogger.com   =>   Crawler and Indexing Section   =>  Click Post and Page Tags Custom Robots Header Tags and their Meaning Directive Meaning all There are no restrictions for indexing or serving. Note: this directive is the default value and has no effect if explicitly listed. noindex Do not show this page in search results and do not show a “Cached” link in search results. nofollow Do not follow the links on this page none Equivalent to noindex, nofollow noarchive Do no...