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- In UNIX-based operating systems, opening a file using a file handle can be done only in the kernel. Give a possible implementation of an NFS file handle for a user-level NFS server for a UNIX system.Give a simple extension to the NFS lookup operation that would allow iterative name lookup in combination with a server exporting directories that it mounted from another server.Consider a distributed file system that uses per-user name spaces. In other words, each user has his own, private name space. Can names from such name spaces be used to share resources between two different users?
- For a dictionary attack on a target server that didn't employ salt, you had previously prepared a file. Except for "impossible," the 171,000 words in this file make up the entire OED. The dictionary can no longer be used due to a 32-bit salt server upgrade. Instead of using brute force to sift through an outdated vocabulary, you should establish a brand-new one. How many total entries does the new dictionary have?Answer the followings:1. Assume that you have an empty buffer pool of size 4 pages and will access this access patternin the given order: RDBMSTHEORY. At the end of accessing all the pattern, what is the contentof the buffer pool (write in alphabetical order)? Use the CLOCK algorithm as the bufferreplacement policy and don't advance the clock when the requested page is already in thebuffer.2. Start with an empty buffer pool of size 4 pages again. This time use this access pattern:♯SAGLIKLIMUTLUBAYRAMLAR♯. At the end of accessing all the pattern, what is the content ofthe buffer pool (write in alphabetical order)? Use the LRU algorithm as the buffer replacementpolicy.An issue that we have glossed over so far is how the client locates the server in remote procedural calls. One method is to hardwire the network address of the server into the client. The trouble with this approach is that it is extremely inflexible. If the server moves or if the server is replicated or if the interface changes, numerous programs will have to be found and recompiled. To avoid this limitation, which kind of binding is appropriate to match up clients and servers? Also explain basic procedure of such binding. OO 6:46 PM
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- Create a performance driver client programme that repeatedly runs random sequences of keys with different lengths ranging from small to large, measuring the time required for each run and printing out or plotting the average running times. It then uses insert to fill a priority queue, remove the maximum to remove half the keys, insert to fill it up again, and remove the maximum to remove all the keys.Suppose that only file descriptors 1 (stdout), 3 (a read connection from filel ) and 4 (a write connection to filel ) are in use. All others are closed. In this situation, first dup(1) is called. Select all the claims that are correct in this situation. write(0, "Ahoy!", 5); writes to the terminal screen. write(0, "Ahoy!", 5); fails and produces an error. write(1, "Ahoy!", 5); writes to the terminal screen. write(1, "Ahoy!", 5); fails and produces an error. write(2, "Ahoy!", 5); writes to the terminal screen. write(2, "Ahoy!", 5); fails and produces an error.One of the problems with the Internet email system is that sending forged emails is relatively straightforward, i.e., it is easy to send an email with a fake sender/from address. One solution to this problem would be for a domain’s mail servers to digitally sign any email originating from the domain. For this to be useful, the public key would need to be made available to clients to validate the signatures. It is proposed that the public keys of the mail servers will be verified and signed by a certification authority (same as SSL/TLS certificates) and distributed via a standardised URL for the domain, e.g., https://mybusiness.com/email.pubkey. (a) Explain how the client would obtain the public key and validate the email server’s digital signatures. (b) Discuss the problem of trusting the obtained public key and how this solution results in public keys that can/cannot be trusted. (c) Indicate whether you believe this approach could be used to prevent forged emails and explain why it…