Nt1310 Unit 1 Question Paper

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Section 7.1
Question 3. What information is contained in routing table ?
Ans. The routing table contains mainly information as below:
It contains the address of a network. It contains the interface or next hop router used to reach the destination network. It also contains the cost value that identifies the desirability of the route to the destination network by using distance, delay and cost. It also contains the timeout value which identifies when the route expires.
Section 7.2
Question 8. How does IS-IS differ from OSPF ?
Ans. The main difference between OSPF and IS-IS is that, OSPF divides large networks into areas. Each OSPF requires an area 0 that identifies the network backbone. All areas are connected to area 0 directly or indirectly …show more content…
IS-IS is best suited for large private networks, but it supports large network than OSPF. IS-IS is typically used within an ISP and easily supports IPv6 routing.
Section 7.3
Question 2 What is the difference between static and dynamic NAT ?
Ans. Dynamic NAT automatically maps internal IP addresses with a dynamic port assignment. Static NAT maps a single private IP address to a single public IP address on the NAT router.
On the NAT device the internal device is identified by the public IP address and the dynamic port number. Static NAT is used to take a server on the private network and make it available on the internet.
Dynamic NAT allows internal hosts to contact external hosts. But external hosts cannot initiate communication with internal hosts. On the other side static mapping allows external hosts to contact internal hosts-external hosts contact internal server using the public IP address and the static port.
Dynamic implementation with the server is called Many-to-one NAT, because many internal private IP addresses are mapped to one public IP address on the NAT router. Static implementation with the server is called one-to-one NAT, because one private IP address is mapped to one public IP address.
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