Alo Sine Alo Alo?

The correct answer is "од 2,4Ghz do 2,4835Ghz". This is because the IEEE 802.11b standard uses the frequency range of 2.4 GHz to 2.4835 GHz for wireless communication. This frequency range is commonly utilized for Wi-Fi networks and is known as the Industrial, Scientific, and Medical (ISM) band.

In the OSI reference model, if there is a change in one layer, it does not affect the other layers. Each layer in the OSI model is designed to operate independently and provide specific functionalities. This separation allows for easier troubleshooting, maintenance, and upgrades without impacting the entire network stack. Therefore, any change in one layer will not have a direct impact on the other layers in the OSI model.

CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) is the correct answer. CSMA/CA is a protocol used in wireless local area networks (WLANs) to avoid collisions between data packets. It works by requiring devices to listen for a clear channel before transmitting data, and if the channel is busy, the device waits for a random period of time before attempting to transmit again. This helps to minimize collisions and improve the overall efficiency of the network.

The correct answer is "Transportni sloj i slojevi iznad njega" (Transport layer and the layers above it). This answer is correct because the OSI reference model consists of seven layers, and the transport layer is the fourth layer. The layers above the transport layer include the session layer, presentation layer, and application layer. These layers are responsible for managing the end-to-end communication between applications and ensuring the reliable delivery of data.

The correct answer includes the frequency ranges of 2.4 GHz and 5 GHz. These frequency ranges can be used without the need for any special permissions or licenses.

The correct answer is "Transportnom sloju" (Transport layer). The transport layer is responsible for the end-to-end delivery of data between the source and destination devices. It ensures that the data is delivered reliably and efficiently by providing services such as segmentation, flow control, and error recovery. This layer establishes connections, manages data transfer, and handles any issues that may arise during transmission.

The correct answer is 7 slojeva. The OSI model refers to the Open Systems Interconnection model, which is a conceptual framework that standardizes the functions of a communication system into seven different layers. These layers, from bottom to top, are: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Each layer has specific responsibilities and interacts with the layers above and below it to ensure effective communication between network devices.

The correct answer is CSMA (Carrier Sense Multiple Access). CSMA is a method used to access a transmission medium in a network. When a station wants to send data, it first checks if any other station is already using the transmission medium. If the medium is idle, the station can start transmitting. If the medium is busy, the station waits for it to become idle before transmitting. This method helps to avoid collisions and ensures efficient use of the transmission medium.

The correct answer is RTS and CTS. These frames are used in the CSMA/CD (Carrier Sense Multiple Access with Collision Detection) protocol to avoid collisions on the network. RTS (Request to Send) is sent by the sender to reserve the channel, while CTS (Clear to Send) is sent by the receiver to acknowledge the reservation. By using these frames, the devices can coordinate their transmissions and avoid collisions, improving the efficiency of the network. PCF (Point Coordination Function) and HCF (Hybrid Coordination Function) are not directly related to CSMA/CD and are not the correct answers.

The given answer suggests that the function of each layer is to provide a service to the layer above it. In this context, "Iznad sebe" means "above itself" in English. Therefore, the explanation implies that each layer in a system or network architecture is responsible for providing a service or functionality to the layer above it.

The correct answer is "Koncentrator." The question asks what is shown in the picture, and the answer is "Koncentrator."

The correct answer is "Dve parnjak celine". This means that a protocol is a set of rules that allows data exchange between two identical computers.

RS-232 is a standard that specifies the electrical and mechanical characteristics of interface circuits between data terminal equipment and data communication equipment. It defines the physical and electrical properties of the connection, such as voltage levels, signal timing, and connector pin assignments. RS-232 is commonly used for serial communication between computers and peripheral devices, such as modems and printers. TCP/IP, OSI, and X.25 are network protocols that operate at higher layers of the networking stack and do not directly deal with the physical layer.

RTS stands for Request to Send. In wireless communication, RTS is used by a wireless station to initiate communication with another wireless station in order to avoid the hidden terminal problem. The hidden terminal problem occurs when two wireless stations are within range of a third station, but not within range of each other. By sending an RTS signal, the station is requesting permission to transmit data and informing other stations to wait until the transmission is complete. This helps to prevent collisions and ensures that the communication is successful.

CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance. It is a protocol used in wireless networks to avoid collisions between transmitting devices. This protocol works by requiring devices to sense the medium before transmitting data. If the medium is busy, the device waits for a random amount of time before attempting to transmit again. This random backoff mechanism helps to reduce the chances of collisions and improves the efficiency of the network. CSMA/CA is commonly used in Wi-Fi networks to ensure fair access to the channel and minimize collisions.

IEEE 802.11 is the correct answer because it refers to the standard for wireless local area networks (WLANs). This standard specifies the protocols and technologies used for wireless communication between devices within a limited area, such as a home, office, or campus. It covers aspects like data rates, frequency bands, security, and network management for wireless networks.

The correct answer is "Fizicki" (Physical). In the OSI reference model, the physical layer is the first layer. It is responsible for the actual transmission and reception of raw bit streams over a physical medium. This layer deals with the physical characteristics of the transmission medium, such as voltage levels, electrical and mechanical specifications, and the physical connectors. It ensures that the data is transmitted reliably and accurately from one device to another.

The given answer "резерисана за слање свима (бродкаст)" means "reserved for sending to all (broadcast)" in English. This suggests that the address containing all 1s is used for broadcasting messages to all stations on the network. Broadcasting is a method of sending a message to all devices on a network simultaneously.

The answer suggests that the same layers are present on different machines. This means that the layers are replicated or duplicated across multiple machines, indicating a distributed system architecture. This approach can provide fault tolerance and scalability by allowing multiple machines to handle the same layers of data or functionality.

Pristupne tačke usluge se označavaju kao SAP.

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The correct answer is "Standard za poveziavnje heterogenih mreza" (Standard for connecting heterogeneous networks). The OSI reference model is a conceptual framework that standardizes the functions of a communication system into seven different layers. It provides a guideline for the design and implementation of network protocols, allowing different types of networks to communicate with each other seamlessly. Therefore, it is a standard for connecting heterogeneous networks.

The correct answer is CSMA/CA. CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance. It is a protocol used in wireless local area networks (WLANs) to avoid collisions between data packets. This protocol requires devices to listen to the wireless medium before transmitting data to ensure that the channel is clear. If the channel is busy, the device waits for a random period of time before attempting to transmit again. This helps to reduce collisions and improve the overall efficiency of the wireless network.

The correct answer is "Инфраструктурни" (Infrastructure). This is because an infrastructure mode is a type of wireless network connection that requires maintenance and management. In this mode, a central device, such as a wireless access point, is used to connect multiple devices to the network. The access point is responsible for managing the network and ensuring that all devices are connected and communicating properly.

PAN stands for Personal Area Network. A Personal Area Network is a network that is used for connecting devices within a small area, typically within a person's personal space such as a home or office. It allows devices such as computers, smartphones, and tablets to communicate with each other and share resources like files and printers.

The correct answer is RTS. RTS stands for Request to Send, and it is a signal used by wireless stations to initiate communication with another wireless station in order to avoid the hidden terminal problem. The hidden terminal problem occurs when two wireless stations are within range of a third station, but not within range of each other. By using RTS, a station can request permission to send data to another station, ensuring that there are no collisions or interference between transmissions.

The correct answer is "Слања, сукобљавања и неактивни периоди" which translates to "Transmissions, collisions, and idle periods." In the CSMA/CD (Carrier Sense Multiple Access with Collision Detection) protocol, stations on a shared network listen for any ongoing transmissions before attempting to transmit data. If multiple stations try to transmit at the same time, a collision occurs and all stations involved detect the collision. After a collision, there is a random backoff time or an idle period before the stations attempt to retransmit the data. Therefore, the correct answer includes all three components of the CSMA/CD protocol.

The given statement states that a frame containing all ones in the destination address field will be sent to all stations in the network. This means that the frame will be broadcasted to every station in the network, ensuring that all stations receive the frame.

The correct answer states that when using the CSMA mechanism for data transmission, the station first checks if the transmission medium is busy before sending data. This is an accurate explanation of the CSMA mechanism, as it ensures that the station avoids collisions with other stations already transmitting on the medium. By checking if the medium is busy before sending data, the station can wait for an idle period to send its data, reducing the chances of collisions and improving overall efficiency of the network.

The correct answer states that the application layer allows the application process to access the OSI environment. This means that the application layer provides the necessary protocols and services for the application process to communicate with other processes in the network. It is responsible for managing the application-level communication and ensuring that the data is properly formatted and delivered to the appropriate destination.

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The correct answer is "sloj sesije" (session layer). The session layer is responsible for managing and controlling the dialogue between applications. It establishes, maintains, and terminates connections between applications, ensuring that data is exchanged correctly and efficiently. This layer handles session establishment, synchronization, and checkpointing, allowing applications to communicate and interact seamlessly.

The correct answer states that there are protocols with and without the establishment of a connection. This means that there are protocols that require a connection to be established before data can be transmitted, and there are protocols that do not require such a connection. This differentiation is important because it determines the way data is transmitted and the level of reliability and efficiency of the transmission.

After 16 unsuccessful attempts, the station in the Ethernet network will give up and inform the higher layers about the error.

The correct answer is 40 MHz. This refers to the channel width of the IEEE 802.11n standard. Channel width determines the amount of frequency spectrum available for data transmission. In this case, a channel width of 40 MHz means that a wider frequency range is utilized, allowing for higher data transfer rates compared to narrower channel widths like 20 MHz or 30 MHz.

The correct answer is 11, 1, and 6. In the 2.4GHz range, these non-overlapping channels are commonly used in the United States.

The correct answer is 5. This answer suggests that the distance between the channel carriers in the 2.4 GHz range is 5 units. However, without further context or information, it is difficult to determine what these units represent or what the significance of this distance is.

IEEE 802.11 uses CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol on the MAC sublayer. CSMA/CA is a protocol used in wireless networks to avoid collisions between devices trying to transmit data simultaneously. It works by having devices sense the wireless medium before transmitting, and if the medium is busy, they wait for a random period of time before attempting to transmit again. This helps to reduce collisions and improve the overall efficiency of the network.

In a logical topology of one to all (broadcast), each node decides whether to accept the packet or not. If a node decides not to accept the packet, it simply ignores it. Therefore, the correct answer is "Порука се једноставно игнорише" which translates to "The message is simply ignored."

The correct answer is 3. ATM (Asynchronous Transfer Mode) standard has three layers: the physical layer, the ATM layer, and the adaptation layer. The physical layer is responsible for transmitting bits over a physical medium. The ATM layer handles cell switching, routing, and multiplexing. The adaptation layer is responsible for converting different types of data into cells that can be transmitted over the ATM network.

The correct answer is 54 mb/s. The question is asking about the theoretical maximum speed that can be achieved using equipment adapted to the IEEE 802.11g standard. The IEEE 802.11g standard supports a maximum data rate of 54 mb/s, which is the fastest speed that can be achieved in this scenario.

The correct answer is WiFi Alliance. WiFi Alliance is an association of manufacturers that certifies products implemented according to the IEEE 802.11 standard, which is commonly known as WiFi. They ensure that WiFi products meet certain standards and interoperability requirements, allowing consumers to trust the quality and compatibility of WiFi devices.

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The correct answer is "Isprepletana mreza" because the given text mentions "na slici je prikazano" which translates to "the picture shows." Therefore, it can be inferred that the image represents a network, and "Isprepletana mreza" means "interwoven network" in English, which could be a suitable description for the image.

CTS stands for Clear to Send. It is a signal used by a wireless station to confirm that it is ready to communicate with another wireless station. This signal is typically sent by the receiving station after it has successfully received a Request to Send (RTS) signal from the transmitting station. The CTS signal helps to avoid collisions and manage the communication between wireless devices in a network.

The correct answer is "Максималном времену пропагације(простирања) између најудаљенијих станица". This means that the time of propagation (spread) between the furthest pages is the maximum. This suggests that the time it takes for information to travel between the most distant pages is the longest, resulting in a longer time for the system to recover from a fault or failure.