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It's well known there is the IP address (ipv4 or ipv6) and the MAC address, but does it exist another addresses?
IP address and MAC are related to Network Interfaces (Wifi interface, Ethernet ,PPP..), and PC could have many interfaces .
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Closed 3 days ago.
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Which of the following IP addresses with IP 20.20.10.9/29 and subnet 255.255.255.248 are in the same subnet and why?
20.20.10.14
20.20.10.7
Thanks.
My result is 20.20.10.7. Because IP addreseses in the same subnet include
20.20.10.0 t0 20.20.10.6
20.20.10.7 to 20.20.10.13
…..
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I could not select the serial port in my Arduino IDE. It is greyed out even if I connect my USB to serial cable. What is the proper driver for that and where I can find that?
The driver for PL2303HX in Mac is here and in windows is here, which you most probably need. If you need the driver for CP210x USB to UART Bridge VCP (virtual com port), it is here.
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If I open the port 22 in my home router so I can connect from the outside and I have three computers behind that router with the port 22 open where would my connection end up? In which of the three computers?
It depends on the router (configuration/software). In most cases it wont go anywhere. To have control over it you will need to redirect the traffic from port 22 to a specific IP address from the router settings.
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I understand the mechanism of ARP but I am wondering why do we use it even if we have the recipient's IP address? Isn't it enough to rely on the recipient's IP address to send packets instead of taking extra steps of finding its matching MAC address?
Thank you.
An IP address is a layer-3 address. Layer-3 packets get encapsulated into layer-2 frames, and layer-2 also has addressing (MAC addresses) which needs to be supplied. ARP (Address Resolution Protocol) resolves the layer-3 IP address to a layer-2 MAC address so that the layer-3 packet can be encapsulated into a layer-2 frame which is then sent out the layer-1 interface.
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I know they are address schemes used in different layers, and that IPV4 is 32 bits while MAC is 48 bits.
My questions are:
Why do we need two different address schemes?
What is the problem if we decided to use the same address for both purposes?
Is there a reason for the MAC address requiring more memory?
Has the introduction of ipv6 changed anything?
MAC addresses is a Layer 2 Address, while IP is a Layer 3 Address.
Layer 1 is phisical layer
Layer 2 is data link layer ---> MAC ADDRESS
Layer 3 is Network Layer ---> IP Address
http://en.wikipedia.org/wiki/OSI_model