Options: means storing records in contiguous blocks according to a key., Stores records sequentially but uses an index to locate records, uses an index for each key type, has records placed randomly throughout the file
A supertype/subtype hierarchy has which of the following features?
Options: Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype., Attributes are assigned at the highest logical level., Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype., Attributes are assigned at the lowest logical level.
Which of the following are benefits of VLANs? They increase the size of collision domains. They allow logical grouping of users by function. They can enhance network security. They increase the size of broadcast domains while decreasing the number of collision domains. They simplify switch administration. They increase the number of broadcast domains while decreasing the size of the broadcast domains.
Which of the following refers to the terms "residual error rate"?
Options: the number of bit errors per twenty four hours of continuous operation on an asynchronous line, The probability that one or more errors will be undetected when an error detection scheme is used, the probability that one or more errors will be detected when an error detection mechanism is used, signal to noise ratio divided by the ratio of energy per bit to noise per hertz
Options: to create a table, defining its columns, integrity constrains, and storage allocation, to add a column/integrity constraint to a table, to redefine a column, to change a table's storage characteristics
What does the passive command provide to dynamic routing protocols?
Options: Stops an interface from sending or receiving periodic dynamic updates., Stops an interface from sending periodic dynamic updates but not from receiving updates., Stops the router from receiving any dynamic updates., Stops the router from sending any dynamic updates.
Options: Hard-coded SQL statements in a program language such as Java., The process of making an application capable of generating specific SQL code on the fly., Hard-coded SQL statements in a procedure., Hard-coded SQL statements in a trigger.