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463.

Which one of the following is a key factor for preferring B⁺-trees to binary search trees for indexing database relations? [1 mark]
(a) Database relations have a large number of records
(b) Database relations are sorted on the primary key
(c) B⁺-trees require less memory than binary search trees
(d) Data transfer form disks is in blocks

asked in Computer Science And Engineering, 2005

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464.

An organization has a class B network and wishes to form subnets for 64 departments. The subnet mask would be: [1 mark]
(a) 255.255.0.0
(b) 255.255.64.0
(c) 255.255.128.0
(d) 255.255.252.0

asked in Computer Science And Engineering, 2005

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465.

In a network of LANs connected by bridges, packets are sent from one LAN to another through intermediate bridges. Since more than one path may exist between two LANs, packets may have to be routed through multiple bridges. Why is the spanning tree algorithm used for bridge-routing? [1 mark]
(a) For shortest path routing between LANs
(b) For avoiding loops in the routing paths
(c) For fault tolerance
(d) For minimizing collisions

asked in Computer Science And Engineering, 2005

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466.

The maximum window size for data transmission using the selective reject protocol with n-bit frame sequence numbers is: [1 mark]
(a) 2ⁿ
(b) 2ⁿ⁻¹
(c) 2ⁿ -1
(d) 2^n-2

asked in Computer Science And Engineering, 2005

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467.

The address resolution protocol (ARP) is used for: [1 mark]
(a) Finding the IP address from the DNS
(b) Finding the IP address of the default gateway
(c) Finding the IP address that corresponds to a MAC address
(d) Finding the MAC address that corresponds to an IP address

asked in Computer Science And Engineering, 2005

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468.

Packets of the same session may be routed through different paths in: [1 mark]
(a) TCP, but not UDP
(b) TCP and UDP
(c) UDP, but not TCP
(d) Neither TCP nor UDP

asked in Computer Science And Engineering, 2005

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