S. If a router has the following Routing table Metric Destination 30.0.0.0 128.1
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S. If a router has the following Routing table Metric Destination 30.0.0.0 128.1.0.0 192.4.10.0 Mask 255.0.0.0 255.255.0.0 255.255.255.0 Next Hop 40.0.0.7 Deliver Direct 128.1.0.9 If it receives a packet with the destination IP of 30.120.8.4 where would it forward it to next and why? 6. What does filter mean when you say a switch/bridge filters and forwards traffic? 7. Why is the CSMA/CD access method not appropriate for wireless networks? 8. What is a PAN? 9. What command in windows or Linux provides the following information? Ethernet adapter Local Area Connection Connection-specific DNS Suffix .: Subnet Mask Default Gateway 192.168.1.2 . : 255.255.255.0 : 192.168.1.1 10. What is the default gateway from the above command? 11. How many bits are in the IPv4 IP address and IPv6 IP address, respectively?Explanation / Answer
5)
Given destination ip address 30.120.8.4.
It is clear that the given ip address belongs to class A. The range of class A is 1-126.
The default subnet mask of the class A network is 255.0.0.0.
Remember that subnet mask is used when we are routing the packet.
This is how it works:
Given ip address 'AND' with the subnet mask in the routing table.
We obtain a network id. If it matches with destination id in the routing table then route the packet to that particular next hop.
If it doesn't match route the packet to a default route.
30.120.8.4 (00011110.01111000.00001000.00000100) AND(&) 255.0.0.0 ( 11111111.00000000.00000000.00000000)
when the above operation is performed the result is 30.0.0.0. And it is matched with the destination entry in table.
Therefore the packet forwarded to the nexthop 40.0.0.7.
6) A switch can check the destination address of the frame and then determine which outgoing port will send the frame. It is very important to filter the network using a switch to split the network into separate collision domains, the regeneration of the packet allow the packet to travel more distance and allow more nodes used in the total network design allowing for dramatically lower collision rate.
7) CSMA/CD cannot be used for wireless networks for two reasons. First, collision detection is very difficult with wireless transmissions. With CSMA/CD, the stations must be able to transmit and listen at the same time. However, in radio systems the signal from a transmitting station is so strong that it will overpower that same station’s ability to simultaneously receive a transmission. In short, while it is transmitting, a station “drowns out” its own ability to detect a collision. A second factor that makes collision detection so difficult with wireless transmission is that all stations would have to be able to detect transmissions from all other stations at all times. In a wireless environment that covers a large area, a station may not be in range of all other stations
8) A personal area network (PAN) is the interconnection of information technology devices within the range of an individual person, typically within a range of 10 meters. For example, a person traveling with a laptop, a personal digital assistant (PDA), and a portable printer could interconnect them without having to plug anything in, using some form of wireless technology. Typically, this kind of personal area network could also be interconnected without wires to the Internet or other networks.
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