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ERASED TEST, YOU MAY BE INTERESTED ON ccna review - vlans

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Title of test: ccna review - vlans Description: always enduring it out of pride Author: Akagi Other tests from this author Creation Date: 12/11/2024 Category: Others Number of questions: 12

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The active topology of the corresponding VLAN or group of VLANs is represented by means of the CST (Common Spanning Tree). MST (Multiple Spanning Tree). IST (Internal Spanning Tree). TPID (Tag Protocol Identifier). PVID (Port VLAN ID). In an ideal world, building networks through a hierarchical structure of switches works well. However, in the real world we come across several situations that make it impossible to build networks through a purely hierarchical structure of switches. Virtual local area networks (VLANs) play an extremely important role in building these networks and represent a widely adopted technology. Among the characteristics of VLANs, select the INCORRECT alternative. The 802.1Q VLAN label consists of a 2-byte field called the Tag Protocol Identifier (TPID) and a 2-byte Tag Control Information (TCI) field. The TCI, in turn, contains a 12-bit VLAN identification field (VLAN Identifier - VID), a 3-bit priority field (Priority Code Point - PCP) similar in purpose to the TOS field of the IP datagram, and a 1-bit field to indicate frames eligible for discard (Drop Eligible Indicator - DEI). Each VLAN represents a broadcast domain, isolating the hosts that make up different VLANs on the same switch. This functionality allows, for example, the efficient use of switches. Imagine that the institution had ten distinct groups of hosts, each group small in size, with less than 10 hosts. Without the VLAN functionality, the isolation of these groups of hosts would require ten distinct switches. VLAN trunking allows switch ports to be configured as trunk ports. These trunk ports belong to all VLANs on a switch, and frames sent to any VLAN are forwarded over the trunk link to the other switch. The IEEE 802.1Q format introduces the VLAN tag into the Ethernet frame to identify which VLAN a given frame belongs to. Although a VLAN locates traffic from a group of hosts in a single broadcast domain, by using a specific MAC address, called the broadcast MAC address, the switch broadcasts frames tagged with the destination address FF-FF-FF-FF-FF-FF to all VLANs present on the same switch. A more scalable approach to interconnecting VLAN switches, standardized by the IEEE802.1Q format, is known as TPID. Link. Vlink. Trunking. joinRouting. The IEEE 802.1Q standard allows virtual local area networks (VLANs) to be created on Ethernet networks. Regarding the IEEE 802.1Q specification, select the INCORRECT alternative. In the IEEE 802.1Q standard, a 32-bit field, called 802.1Q tag, is added between the Source MAC and EtherType fields. A total of 8190 VLAN identifiers (VIDs) can be specified using IEEE 802.1Q. The 802.1Q tag field is subdivided into four fields: 16-bit Tag Protocol Identifier (TPID); 3-bit Priority Code Point (PCP); 1-bit Drop Eligible Indicator (DEI); and 12-bit VLAN Identifier (VID). The VLAN Identifier (VID) field values ​​0x000 and 0xFFF are reserved. A value of 0x000 may indicate that the Ethernet frame does not carry any VID. Virtual local area networks, or VLANs, must comply with the IEEE 802.1Q standard. This standard establishes the use of tags that identify each data frame that travels through a local computer network. In this way, the frames can be separated and correctly forwarded to the devices belonging to a specific VLAN. Select the correct alternative regarding the IEEE 802.1Q standard for VLANs. The TCI (tag control information) field of an 802.1Q header has four bytes and, within this, is the TPID (tag protocol identifier). An original Ethernet frame is encapsulated in another frame, when using the IEEE 802.1Q standard, so that it can be identified in the network assets. The identification tag of a VLAN is present in the first two bytes of the Source MAC and Destination MAC fields of an Ethernet frame. The protocol identification tag (TPID) occupies two of the four bytes added to the Ethernet data frame. The VLAN identification tag is inserted into the ToS field of the Internet Protocol (IP) data packet. The Ethernet frame header contains a 3-bit field called PCP. About this field, select the correct alternative. It contains a value used by spanning tree to avoid loops in the network. It contains a tag that identifies the VLAN to which the frame belongs. It specifies a priority that can be used to implement QoS (Quality of Service). It specifies the network protocol used to correctly forward the frame when it reaches the destination. It contains a value that defines whether the frame can be discarded by the router in cases of network slowness. A type of VLAN that automatically assigns an ID to a device based on its MAC address is called: Dynamic VLAN Request VLAN Authoritative VLAN Administrative VLAN Tagging VLAN. Regarding the use of VLANs (Virtual Local Area Network), analyze the statements and mark with T for true and F for false. I. They can be created and configured in HUBs and also in Layer 2 Switches. II. Each VLAN in a local network is identified by an ID between 1 and 4094. III. It allows subdividing a physical network into several logical subnets, allowing isolation between groups of devices. IV. An Access port can be configured for more than one VLAN at the same time. Indicate the CORRECT alternative: V V V F F V V F F F V F V F V V V V F F. During a thorough analysis of network traffic, a network engineer noticed that one of the switches received an 802.1Q Ethernet frame. Upon inspecting the frame, he found that one of the fields contained the hexadecimal value 0x8100. The field in the Ethernet frame that invariably has this value is the: canonical format indicator; priority that determines the main VLANs; priority that has nothing to do with VLAN; VLAN protocol ID, this value being greater than 1500; VLAN protocol ID, this value being less than 1500. VLAN (Virtual Local Area Network) is a technique that consists of creating a logically independent network within a single piece of equipment. Analyze the statements below regarding the characteristics of VLANs. 1. They allow the segmentation of physical networks and communication between hosts in different VLANs must go through routers or other devices with routing capabilities. 2. They allow the switch to route traffic between subinterfaces. 3. VLAN provides an effective method of conserving IP addresses. 4. Bandwidth can be used more efficiently, allowing multiple logical networks to use the same network infrastructure. Select the alternative that indicates all the correct statements. Only statements 1 and 3 are correct. Only statements 1 and 4 are correct. Only statements 2 and 3 are correct. Only statements 2 and 4 are correct. Only statements 3 and 4 are correct. According to the 802.1q and 802.1p standards, it is possible to define, respectively, 8 priority levels at layer 3 − 2048 different VLANs. 16 bits for VLAN identifier (VID) − 6 bits for priority at layer 2. 3 priority bits − 16 bits for MAC addressing 48 bits for MAC addressing − 2 canonical bits. up to 4096 different VLANs − 8 priority levels at layer 2. According to Kurose (2021), a switch that supports Virtual Local Area Networks (VLANs) allows multiple virtual local networks to be run through a single physical infrastructure of a local network, with the switch ports being divided into groups and each group forming a VLAN. Consider the following example of a switch with two VLANs configured, one for the Electrical Engineering department and one for the Computer Science department. Regarding the VLANs in the figure above, analyze the following statements. I- Broadcast packets, such as those from the ARP protocol, generated in one of the VLANs, are forwarded to all switch interfaces. II- The use of VLANs isolates traffic between the Electrical Engineering and Computer Science departments. III- To forward traffic between the two VLANs, a router connected to two switch ports or a multilayer switch, which contains the functions of a router, is required. Only the following are correct: I. II. I and II. I and III. II and III.

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