Consider an enterprise network with two Ethernet segments, a web server and a firewall, connected via three routers as shown below.
What is the number of subnets inside the enterprise network?
Consider the resolution of the domain name www.gate.org.in by a DNS resolver. Assume that no resource records are cached anywhere across the DNS servers and that iterative query mechanism is used in the resolution. The number of DNS query-response pairs involved in completely resolving the domain name is __________.
Consider routing table of an organization's router shown below :
| Subnet number | Subnet mask | Next hop |
|---|---|---|
| 12.20.164.0 | 255.255.252.0 | R1 |
| 12.20.170.0 | 255.255.254.0 | R2 |
| 12.20.168.0 | 255.255.254.0 | Interface 0 |
| 12.20.166.0 | 255.255.254.0 | Interface 1 |
| default | R3 |
Which of the following prefixes in CIDR notation can be collectively used to correctly aggregate all of the subnets in the routing table?
Consider a network with three routers P, Q, R shown in the figure below. All the links have cost of unity.
The routers exchange distance vector routing information and have converged on the routing tables, after which the link Q-R fails. Assume that P and Q send out routing updates at random times, each at the same average rate. The probability of a routing loop formation (rounded off to one decimal place) between P and Q, leading to count-to-infinity problem, is _____________