After the data is transformed into a series of bits, it must be
converted into signals that can be sent across the network media to its
destination. Media refers to the physical medium on which the signals
are transmitted. Examples of media are copper wire, fiber-optic cable,
and electromagnetic waves through the air. A signal consists of
electrical or optical patterns that are transmitted from one connected
device to another. These patterns represent the digital bits (i.e. the
data) and travel across the media from source to destination as either a
series of pulses of electricity, pulses of light, or radio waves.
Signals may be converted many times before ultimately reaching the
destination, as corresponding media changes between source and
destination.
There are three common methods of signal transmission used in networks:
Electrical signals - Transmission is achieved by representing data as electrical pulses on copper wire.
Optical signals - Transmission is achieved by converting the electrical signals into light pulses.
Wireless signals - Transmission is achieved by using infrared, microwave, or radio waves through the air.
In
most homes and small businesses, network signals are transmitted across
copper wires (cables) or Wi-Fi enabled wireless connections. Larger
networks employ fiber-optic cables in order to reliably carry signals
for longer distances.
The animation below is a representation of three different types signals used in networks.
https://killer.sh Pre Setup Once you've gained access to your terminal it might be wise to spend ~1 minute to setup your environment. You could set these: alias k = kubectl # will already be pre-configured export do = "--dry-run=client -o yaml" # k get pod x $do export now = "--force --grace-period 0" # k delete pod x $now Vim To make vim use 2 spaces for a tab edit ~/.vimrc to contain: set tabstop=2 set expandtab set shiftwidth=2 More setup suggestions are in the tips section . Question 1 | Contexts Task weight: 1% You have access to multiple clusters from your main terminal through kubectl contexts. Write all those context names into /opt/course/1/contexts . Next write a command to display the current context into /opt/course/1/context_default_kubectl.sh , the command should use kubectl . Finally write a second command doing the same thing into ...
Last updated 4 Aug 11 Course Title: OWASP Top 10 Threats and Mitigation Exam Questions - Single Select 1) Which of the following consequences is most likely to occur due to an injection attack? Spoofing Cross-site request forgery Denial of service Correct Insecure direct object references 2) Your application is created using a language that does not support a clear distinction between code and data. Which vulnerability is most likely to occur in your application? Injection Correct Insecure direct object references Failure to restrict URL access Insufficient transport layer protection 3) Which of the following scenarios is most likely to cause an injection attack? Unvalidated input is embedded in an instruction stream. Correct Unvalidated input can be distinguished from valid instructions. A Web application does not validate a client’s access to a resource. A Web action performs an operation on behalf of the user without checkin...
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