Computer Knowledge

Computer Networks

2,614 Questions

Computer networks involve the architecture, protocols, and security measures used for digital communication. This collection covers OSI model layers, IP addressing, data transmission, and cryptographic standards. These concepts are vital for the computer knowledge sections of banking and government exams.

OSI model layersNetwork protocolsIP subnet maskingData encryption standardsServer configurationsNetwork commands

Computer Networks Questions

Multiple choice

By default, how is IP traffic filtered in a Cisco router?

  1. Blocked in and out of all interfaces.

  2. Blocked on all inbound interfaces, but permitted on all outbound interfaces.

  3. Permitted in and out of all interfaces.

  4. Blocked on all outbound interfaces, but permitted on all inbound interfaces.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cisco routers permit all IP traffic by default on all interfaces unless access lists are applied. The 'permit any any' implicit rule exists in both directions. This default behavior allows traffic to flow freely until explicitly restricted by the administrator through ACLs.

Multiple choice

After conducting research to learn about common remote connection options for teleworkers, a network administrator has decided to implement remote access over broadband to establish VPN connections over the public Internet. What is the result of this solution?

  1. A reliable connection is established at greater speeds than what is offered from dialup over POTS.

  2. Security is increased, but username and password information are sent in plain text.

  3. The connection has increased security and reliable connectivity. Users need a remote VPN or VPN client software.

  4. Security and reliability are increased at a substantial loss in throughput, which is considered acceptable when supporting a single user environment.

  5. Reliability and security are increased without the need for additional equipment, when compared to dialup connections using POTS.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

VPN over broadband provides secure, encrypted tunnels through the public internet, combining the security of traditional VPNs with the high speed and reliability of broadband connections. Users need VPN client software to establish these tunnels. This solution offers better performance than dialup while maintaining security through encryption, not plain text transmission.

Multiple choice

The IMAP protocol is used for which internet service?

  1. Web hosting

  2. File transferring

  3. E-mail

  4. Online chatting

  5. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct choice. IMAP stands for "Internet Message Access Protocol" and is pronounced "eye-map." It is a method of accessing e-mail messages on a server without having to download them to thelocal hard drive.

Multiple choice

What is the main role of TCP/IP software while accessing any web page?

  1. It requests DNS for the IP address corresponding to web address.

  2. It only breaks the request and the response of the HTTP software running on the client and server machine.

  3. It replies with the IP address of the requested web page of client to the browser.

  4. It only reassembles the request and the response of the HTTP software running on the client and server machine.

  5. It breaks and reassembles the request and response of the HTTP software running on the client and server machine.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

TCP/IP software running on the client breaks the HTTP request into packets, and sends them over TCP to the web server. The TCP/IP software running on the web server reassembles the HTTP request, and the HTTP software hands over this HTTP response to the TCP/IP software, which breaks the HTTP response into packets, and sends them to the client. Here again, the packets are reassembled by the TCP/IP.

Multiple choice

In a client-server application connection with no middle-tier, what are the five server stack components?

  1. Oracle database, TTC, Oracle Net, OPS, and Protocol

  2. Oracle database, Oracle Net, OSI, TTC, and Protocol

  3. Forms/SQL*Plus, OPS, TTC, Oracle Net, and Protocol

  4. Oracle Net, TTC, OPS, OCI, and Protocol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The five server stack components in a direct client-server connection are: Oracle database (data storage), TTC (Two Task Common layer for data representation), Oracle Net (network communication layer), OPS (Oracle Program Interface for OCI calls), and Protocol (network protocol like TCP/IP). Options B, C, and D have incorrect component orders or missing components.

Multiple choice

The local naming method is being used to connect to a remote server and the service name is being provided in the connection request. This service name is mapped to a network address contained in a _________.

  1. Connect Descriptor

  2. Connect Identifier

  3. Connect String

  4. Connected Directory
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Oracle's local naming method, a service name provided in the connection request is mapped to a Connect Descriptor stored in the tnsnames.ora file. A Connect Descriptor contains the complete network address (protocol, host, port, service name) needed to establish the connection. Connect Identifier is the generic name, Connect String is the full syntax, and Connected Directory is not a standard Oracle term.

Multiple choice

A client-server application has become very popular and hundreds of users are accessing the Oracle Server daily. Which of the following networking solutions should be implemented to ensure that all users can access the Oracle Server?

  1. Dedicated Server

  2. Directory Naming

  3. Oracle Connection Manager

  4. Heterogeneous Services
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The correct answer is C because Oracle Connection Manager provides connection pooling and multiplexing capabilities that allow hundreds of users to efficiently share network connections to the Oracle Server. Dedicated Server (A) assigns one server process per user, which doesn't scale well. Directory Naming (B) is for name resolution, not connection management. Heterogeneous Services (D) is for accessing non-Oracle data sources.

Multiple choice

Which of the following protocols is used by web browsers when they connect to servers on the World Wide Web?

  1. SMTP

  2. TCP

  3. UDP

  4. POP

  5. ISP
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite (IP), and is so common that the entire suite is often called TCP/IP. TCP provides reliable, ordered, error-checked delivery of a stream of octets between programs running on computers connected to a local area network, intranet or the public Internet. It resides at the transport layer.Web browsers use TCP when they connect to servers on the World Wide Web, and it is used to deliver email and transfer files from one location to another.

Multiple choice

In a client-server application connection with no middle-tier, what are the five server stack components?

  1. Oracle database, TTC, Oracle Net, OPS, and Protocol

  2. Oracle database, Oracle Net, OSI, TTC, and Protocol

  3. Forms/SQL*Plus, OPS, TTC, Oracle Net, and Protocol

  4. Oracle Net, TTC, OPS, OCI, and Protocol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The five server-side components are: Oracle database (the instance), TTC (Two Task Common - character conversion), Oracle Net (network layer), OPS (Oracle Protocol Support), and the network Protocol (TCP/IP, etc.). Option B places OSI incorrectly, and options C/D include client-side components (Forms, SQL*Plus, OCI) rather than server components.

Multiple choice

The local naming method is being used to connect to a remote server and the service name is being provided in the connection request. This service name is mapped to a network address contained in a _________.

  1. Connect Descriptor

  2. Connect Identifier

  3. Connect String

  4. Connected Directory
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Oracle Net Services, the local naming method uses a tnsnames.ora file where service names are mapped to connect descriptors. A connect descriptor contains the complete network address and configuration details needed to establish a connection to a remote Oracle database server. Connect Identifier is the service name itself, Connect String is the full connection specification, and Connected Directory is not a valid Oracle networking term.