<span>D - graphical user interface</span>
Answer:
MAC Addresses (Destination and Source MAC address)
Explanation:
A switch has 3 primary functions:
- Forward frames
- Learn addresses
- Avoid loops
An Ethernet frame has the header, data and trailer and there are two specific fields in the header that helps the switch to know where to send data in future transmissions.
- destination MAC address
- source MAC address
every Ethernet frame has this and when the frame hits a switch or any device, any device can look at it ( an Ethernet frame ) and know where it is suppose to go and where it came from.
Every switch has a MAC address table where it stores MAC addresses of different computers on the network.
Example:
When a PC1 sends a frame to PC2 through a switch, the switch looks at the header of the Ethernet frame for the source mac address and adds the source MAC address to its MAC address table and also the port that it came through.
simply put:
A switch looks at the source MAC address to see if it knows it already, if it does. Great! no need to add it again to it's address table.
If it doesn't, it adds it's source address and the port that the frame came from.
This basically how the switch populates its MAC address table.
<span>A numeric string is created by a cryptographic
algorithm, which is called a hash that is used to validity of a message or authenticity
of a document. The signature is verified by an algorithm that uses the stated
owner of the signature's public key to accept or reject the authenticity of a
signature. A certification authority's digital signature is used to verify the
authenticity of digital certificates and other documents in a PKI.</span>
Health care robots the key word, being "robots" aren't able to act as we can as humans.
Robots and systems lack the emotional skills that we as humans have, they are not intuitive.
There are many risks in using robots for health care, although, "health care" is a vague term, so I'll cover a few in general:
- Doctor/patient confidentiality is risked when using robots to handle personal medical matters, systems are never 100% secure.
- Robots and systems cannot emphasise with patients and will make decisions based on logic and theoretics, not emotionally - for example, if a patient is in a state of bad mental health, a robot will not be able to effectively analyse the right methods to take.
- The collection, storage and passing-on of patient information is risked as system encryption is never guaranteed.
1) Bricklayer 2) Roofer 3) Architectural drafter 4) landscape architect
