Network Statistics Measurement Systems — Test 1

Correct Answer: A. A. Traffic
Explanation: There are various network management methods such as fault management, security management, accounting management, address management etc. Traffic management is also a major aspect of network management.

Correct Answer: B. B. Protocol analyzers
Explanation: One of the best ways to gather network statistics is to capture packets traversing network segments or across node interfaces in a promiscuous mode. We have learned that protocol analyzers do just that. Thus, they are good tools to gather network statistics.

Correct Answer: D. D. Data link layer
Explanation: The RMON1 MIB groups and tables are used to gather statistics at the data link layer in Ethernet and token ring LANs. The RMON2 MIB groups and tables define parameters for higher-layer statistics.

Correct Answer: C. C. It is obtained by measuring ip packets at the network layer level
Explanation: Load statistics in an IP network can also be obtained by measuring IP packets at the network layer level. The entities in the network layer host and the network layer matrix groups in RMON2 MIB can be used for this measurement

Correct Answer: B. B. False
Explanation: The source, the destination, and the source-destination pair are used for traffic load monitoring. Data for traffic monitoring can be sampled at the data link layer using the RMON1 MIB history group and not using the RMON2 SMI group which has a totally different application.

Correct Answer: D. D. Bandwidth
Explanation: We can obtain the traffic load for different applications such as file transfer (FTP), Web data (HTTP), and news groups (NNTP). This information can be used for bandwidth management of real-time and non-real-time traffic.

Correct Answer: B. B. False
Explanation: SMI provides a very simple view of the network. Every element is completely defined by a set of variables, which may take on a limited number of data types. These include scalar or primitive types and three structured or constructed types (arrays, records, and sets). A record is an ordered collection of elements of different types, with each element referred to by name.

Correct Answer: C. C. Manager
Explanation: A record can be defined to bold related variables pertaining to one part of an NE (in one subtree of the MIB). Another record with identical fields but different names must be defined The SNMP protocol allows a manager to get or set the value of a variable.

Correct Answer: B. B. False
Explanation: A rate is a derived measure. The derived measure of rate is imprecise and gives different results depending on the averaging interval. Different managers may require different averaging intervals and even one manager may require different averaging intervals at different times.

Correct Answer: B. B. It provides a convenient mechanism to build network-monitoring systems
Explanation: The RMON MIB that we studied in, along with the SNMP communication protocol provides a convenient mechanism to build network-monitoring systems.