The values of Network Interface counters measure the number of bytes sent or received over a TCP/IP connection. No pre-defined values have been set for these counters. A sudden increase in the network traffic indicates an external attack. The counters used to measure the network traffic are as follows:
Network Interface: Bytes Received/sec: This counter shows the rate at which bytes are received by a network. A sudden and unexpected increase in the value of this counter indicates an external attack on the network.
Network Interface: Bytes Sent/sec: This counter shows the rate at which the bytes are sent through the network. A sudden increase in the value of this counter indicates that a large volume of data is being accessed. It also indicates an external attack on the network.
Network Interface: Bytes/sec: This counter measures the rate at which the bytes are sent through or received by a network. A sudden increase in the value of this counter indicates an external attack on the network.
Network Interface: Output Queue Length: This counter is maintained by TCP/IP. It is used to measure the number of output packets in a queue. An increase in the value of this counter indicates that the server is experiencing periods of unresponsiveness. Its value can also increase if the server contains faulty network hardware.

Cross Site Scripting vulnerabilities or XSS flaws arise every time an application takes a user-supplied data and sends it to a Web browser without first confirming or encoding the content. A number of times attackers find these flaws in Web applications. XSS flaws allow an attacker to execute a script in the victim's browser, allowing him to take control of user sessions, disfigure Web sites, and possibly launch worms, viruses, malware, etc. to steal and access critical data from the user's database.
Answer option A is incorrect. Injection flaws are the vulnerabilities where a foreign agent illegally uses a sub-system. They are the vulnerability holes that can be used to attack a database of web applications. It is the most common technique of attacking a database.
Injection occurs when user-supplied data is sent to an interpreter as part of a command or query. The attacker's hostile data tricks the interpreter into executing involuntary commands or changing data. Injection flaws include XSS (HTML Injection) and SQL Injection.
Answer option B is incorrect. Cookies are small collections of data stored on a client computer by a web server. By themselves, cookies are not a source of insecurity, but the way they are used can be. Programmers can foolishly store passwords or secret information in a cookie. A browser flaw could permit a site to read another site's cookies.
Cookies containing session information could be stolen from a client computer and used by a hacker to hijack the user's logon session. Cookies are used to track a user's activities, and thus can leave a trail of sites users have visited. Users should block third-party cookies. Users should also use a secure browser and apply patches and updates as they become available.
Answer option C is incorrect. Cross-site request forgery, also known as one-click attack or session riding, is a type of malicious exploit of a website whereby unauthorized commands are transmitted from a user that the website trusts. Unlike cross-site scripting (XSS), which exploits the trust a user has for a particular site, CSRF exploits the trust that a site has in a user's browser. The attack works by including a link or script in a page that accesses a site to which the user is known to have authenticated.

A Multipoint Control Unit (MCU) is a device frequently used to bridge video conferencing connections. The Multipoint Control Unit is an endpoint on the LAN that provides the ability for 3 or more terminals and gateways to participate in a multipoint conference. The MCU consists of a mandatory Multipoint Controller (MC) and optional Multipoint Processors (MPs).
Answer option C is incorrect. IP Phones provide IP endpoints for voice communication.
Answer option D is incorrect. A call agent provides call control for IP phones, CAC, bandwidth control and management, and address translation. Unlike a gatekeeper, which in a Cisco environment typically runs on a router, a call agent typically runs on a server platform. Cisco Unified Communications Manager is an example of a call agent.
The call agent controls switching logic and calls for all the sites under the central controller.
A central gateway controller includes both centralized configuration and maintenance of call control functionality, when new functionality needs to be added, only the controller needs to be updated.
Answer option B is incorrect. A videoconference station provides access for end-user involvement in videoconferencing. The videoconference station contains a video capture device for video input and a microphone for audio input. A user can view video streams and hear audio that originates at a remote user station.

Fibre Channel over Ethernet (FCoE) is an encapsulation of Fibre Channel frames over Ethernet networks. It allows Fibre Channel to use 10 Gigabit Ethernet networks while preserving the Fibre Channel protocol. FCoE maps Fibre Channel over selected full duplex IEEE 802.3 networks for providing I/O consolidation over Ethernet and reducing network complexity in the datacenter. The FCoE protocol specification replaces the FCO and FC1 layers of the Fibre Channel stack with Ethernet.
Answer option D is incorrect. It is not a correct statement about Fibre Channel over Ethernet (FCoE).

The Virtual Desktop Infrastructure (VOI) is used to virtualize the desktop environment delivering enterprise-class control, and to increase the manageability. It maintains the familiar end-user environment. It virtualizes the desktop images that are deployed from a centralized hosting server. It provides the end user with a virtual PC that works same as their current PC. It is used to consolidate the number of servers that support desktops. It has the following advantages:
1. Green Solution
2. Cost Efficiency
3. Improved Manageability
4. Central management of files and user's profile.