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Q1) Suppose a network with 10^9 hostnames (not including the names of the nameservers themselves) uses non-recursive DNS. Assume that there is a single root nameserver, multiple local nameservers, and M levels of nameservers in between local nameservers and the root nameserver. Each nameserver has N names in its database. (a) If M=1, find N. If M=2, find N. If M=3, find N. [Hint: First, draw the DNS tree for M=1, and make sure you know what entries are in each DNS table.] (b) Assume that the total of transmission, propagation and queueing delay for each message takes 0.2 seconds. Assume that the processing delay of a single DNS nameserver to respond to a DNS query takes 0.5 log(N) seconds, if the nameserver has N names in its database, where the log is base 10. Compare the time for a query and response for a complete DNS query and response (to all required nameservers) if M=1, M=2, and M=3.
CMP provides many useful services, yet some organizations block ICMP traffic. Why should an organization block ICMP traffic?
For a language L over alphabet Sigma, let sup(L) denote language of all strings in Sigma* that contain a string of L as s substring.
A typical signal sequence in synchronous connection contains significant amount of information in addition to just intended message or data.
Let N users participating in audio/video conference by using IP multicasting. How many distinct SSRCs are required?
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What is the relationship between individual characteristics and job satisfaction?
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safekeeping posture of enterprise (venture) wired and wireless LANs (WLANs), steps listed in OWASP, Securing User Services, IPV4 ip address, IPV6 address format, V4 address, VPN, Deploying Voice over IP, Remote Management of Applications and Ser..
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