<span>a. DA
Given the question and available options, this looks like a question about Ethernet frames. So let's look at the options and see what makes sense.
a. DA
* DA - Destination address. And the question pretty much defines what it is. So this is the correct choice.
b. SA
* SA - Source address. This is the physical address that the frame was sent from. And since the question is mentioned who the frame is intended for, this is obviously the wrong choice.
c. SFD
* SFD - Start Frame Delimiter. This is a special CONSTANT sequence of bits that terminates the preamble. It's purpose is to indicate the start of the frame payload. Since it's a constant value, it does not indicate in any way where the frame is intended to go. So this is a bad choice.
d. Preamble
* Preamble - is a pattern of alternating 0 and 1 bits intended to synchronize receivers so that the rest of the frame is interpreted correctly. This too is a constant value and as such can't indicate the destination of the frame, so it's a bad choice.</span>
No you can not. It will not allow you to
Answer:
Your computer now has the IP address of that website cached, and no longer has to lookup the IP address of that domain name. The TTL of the first query is bigger than the TTL of the second query as less time was taken to execute the request.
Explanation:
On the first request to the website, the computer needs to contact other machines to find the record of the IP address.
On the second request, the computer already has the IP address and can use that to connect.
Answer:
The host-based firewall settings are blocking the service
Explanation:
Host-based firewall settings can be configured on each workstation. The firewall can be provided by the operating system itself, or it can be a standalone software package that provides security features and functionality for the device's network connection. If this firewall contains incorrect settings, legitimate services can be blocked, and if so, a message will usually notify the user of such a breach. In these cases, the firewall settings need to be adjusted to make the desired service work.
