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Post office protocol (POP) is a message access protocol which is used to extract message for client. In this regard, which of the following are true ? (A) POP has two modes, Delete mode and keep (B) In Delete mode, mail is deleted from mail box after each retrival (C) In Delete mode, mail is deleted from mail box before each retrieval (D) In keep mode, mail is deleted before retrival (E) In keep mode, mail remains in mail box after retrival Choose the correct answer from the options given below:
A circular queue has been implemented using a singly linked list where each node consists of a value and a single pointer pointing to the next node. We maintain exactly two external pointers FRONT and REAR pointing to the front node and the near node of the queue, respectively. Which of the following statements is/are CORRECT for such a circular queue, so that insertion and deletion operations can be performed in O(1) time? I. Next pointer of front node points to the rear node. II. Next pointer of rear node points to the front node.
If needed to split a node or coalesce it with its siblings, or redistribute key values between siblings, the crabbing protocol locks the parent of the node in ____________ mode.
In a dicot pot herb, vaseline/vegetable oil was applied on the upper surface of one leaf (Experimental leaf 1) and on the lower surface of another leaf (Experimental leaf 2). Vaseline/Vegetable oil was not applied to the control leaf. The plant was deliberately not watered for several days. Which leaf will dry up last?
If a node is locked in ______________ the subtree rooted by that node is locked explicitly in shared mode, and that explicit locking is being done at a lower level with exclusive-mode locks.
Statement 1: When a node is split during insertion, the middle key is promoted to the parent as well as retained in right half-node. Statement 2: When a key is deleted from the leaf, it is also deleted from the non-leaf nodes of the tree.
Three statements are followed by four conclusions numbered I, II, III and IV. You have to consider these statements to be true, even if they seem to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements. Statements: 1. No plant is a flower. 2. No flower is a leaf. 3. Some plants are leaf. Conclusions: I. No leaf is a plant. II. No leaf is a flower. III. Some flowers are plants. IV. All leaf are plants.
In crabbing protocol, the lock obtained on the root node is in _________ mode.
Consider the following statements regarding the complete incidence matrix (A) of order n × b (a) The elements aij of A = 1, if branch j is associated with node i and orientation is towards node i (b) The element aij of A = -1, if the branch j is the cut set i and the orientation coincide (c) The element aij of A = 1­, if the branch j is associated with node i and orientation is away from node i (d) The element aij of A = 0, if the branch j is not associated with node i Which of the above statements are correct?
For the network below, the objective is to find the length of the shortest path from node P to node G. Let dij be the length of directed are from node i to node j. Let sj be the length of the shortest path from P to node j. Which of the following equations can be used to find SG ?