Network + v2 - 3.2.10 Lesson Review
What distinguishes a collision domain from a broadcast domain? answer Collision domains are established by routers, while broadcast domains are established by switches. Collision domains are about physically shared media, and their borders are established by bridges and switches. Collision domains can span multiple routers, while broadcast domains are limited to a single switch. Broadcast domains require a layer 2 broadcast address to be established.
Correct Answer: Collision domains are about physically shared media, and their borders are established by bridges and switches. Explanation Collision domains refer to network segments where data packets can collide due to shared media access. Bridges and switches segment networks into separate collision domains by providing dedicated paths for data packets, thus reducing collisions. Broadcast domains, on the other hand, are defined by routers at layer 3 and determine the reach of broadcast traffic within a network. Collision domains are not established by routers; they are segmented by bridges and switches. Broadcast domains are defined by routers, not switches. While broadcast domains involve layer 3 devices and protocols, the requirement for a layer 2 broadcast address is not what distinguishes them from collision domains. Collision domains are segmented by bridges and switches, not routers, and do not span multiple routers. Broadcast domains can span multiple switches and are limited by routers. References 1.3.3 Data Link Layer Functions
What is the primary benefit of configuring a switch port to "autonegotiate" speed and duplex settings? It allows the switch port to automatically adjust to the highest possible speed and duplex mode based on the capabilities of the connected device. It disables the switch port from connecting to devices that do not support gigabit speeds. It manually sets the switch port to operate at a fixed speed and duplex mode, disregarding the capabilities of the connected device. It restricts the switch port to operate only at the lowest possible speed for compatibility with older devices.
Correct Answer: It allows the switch port to automatically adjust to the highest possible speed and duplex mode based on the capabilities of the connected device. Explanation Allowing the switch port to automatically adjust to the highest possible speed and duplex mode based on the capabilities of the connected device is correct because the primary purpose of the autonegotiation protocol is to enable two devices on a network link to automatically choose the best speed and duplex mode that both devices support, thereby optimizing their connection without manual configuration. Autonegotiation aims to operate at the highest possible speeds supported by both devices, not the lowest. The protocol is designed to enhance compatibility while maximizing performance. Autonegotiation is an automatic process, not a manual one. Manually setting speed and duplex would involve specific commands to set those parameters and would disable autonegotiation. Autonegotiation does not disable connections with devices of lower speeds. Instead, it allows the switch port to adjust to the highest common speed between the connected devices, whether that is gigabit speed or lower. References 1.3.3 Data Link Layer Functions
What is the role of the CSMA/CD protocol in a hub-based Ethernet network? It increases the data transmission speed of the hub. It assigns IP addresses to devices connected to the hub. It encrypts data to prevent unauthorized access. It manages the timing of data transmissions to avoid collisions.
Correct Answer: It manages the timing of data transmissions to avoid collisions. Explanation The Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol is used in Ethernet networks to manage how devices on the same network segment transmit data. It allows devices to "listen" to the network to ensure no other device is transmitting (Carrier Sense). If the network is clear, a device can transmit. If two devices transmit simultaneously, a collision occurs. CSMA/CD then manages the retransmission attempts after random time delays to minimize the chance of repeated collisions. This protocol is crucial in hub-based networks, where all devices share the same collision domain. CSMA/CD is a network protocol that manages data transmission to avoid collisions, not a security protocol for encrypting data. CSMA/CD does not deal with IP address assignment. IP addresses are typically managed by a DHCP server or manually configured on each device. CSMA/CD does not directly affect the speed of data transmission. Its role is to minimize collisions to ensure efficient use of the network's bandwidth, not to increase the transmission speed itself. References 1.3.3 Data Link Layer Functions
What advantage does a stackable switch offer over a non-stackable switch? It simplifies network management by allowing multiple switches to be managed as a single unit. It allows for physical stacking only, without any management benefits. It cannot be managed as a single unit. It offers fewer ports.
Correct Answer: It simplifies network management by allowing multiple switches to be managed as a single unit. Explanation Simplifying network management by allowing multiple switches to be managed as a single unit is a key benefit of stackable switches, enhancing network scalability and simplifying management by treating multiple switches as a single entity. The primary advantage of stackable switches is precisely that they can be managed as a single unit. Stackable switches do not inherently offer fewer ports; the stacking feature is about management and scalability rather than limiting port availability. Stackable switches offer more than just physical stacking; they allow for simplified management and scalability by operating as a group. References 1.3.3 Data Link Layer Functions
Which type of switch is typically used in a corporate network environment? SOHO switch Unmanaged switch Managed switch Desktop switch
Correct Answer: Managed switch Explanation The correct answer is a managed switch. Managed switches are preferred in corporate environments for their configurability, which supports more complex network requirements and security policies. Unmanaged switches are more likely to be found in smaller or home office networks due to their lack of configurable settings. Desktop switches can be either managed or unmanaged and refer more to the form factor than to the suitability for a particular network environment. SOHO (Small Office/Home Office) switches are typically simpler and may not offer the advanced features required in a corporate network, which often necessitates managed switches. References 1.3.3 Data Link Layer Functions
t which layer of the OSI model does a hub operate? Network Layer Application Layer Physical Layer Data Link Layer
Correct Answer: Physical Layer Explanation Hubs operate at the Physical layer of the OSI model. They are concerned with transmitting raw bits over a network segment without interpreting any data. Their function is purely electrical, regenerating and broadcasting signals to all connected devices. The Application layer is where network applications operate, far above the functionality of a hub. The Network layer is responsible for data routing, which is not a function of a hub. The Data Link layer is responsible for data frame detection, which is more sophisticated than the basic signal repeating performed by hubs. References 1.3.3 Data Link Layer Functions 3.2.1 Hubs 3.2.3 Switches
network technician wants to upgrade the company's hub to isolate collision domains from each other and allow for Gigabit Ethernet. Which solution would help the technician to accomplish this? Hub Network Adapters Switch Router
Correct Answer: Switch Explanation An Ethernet layer 2 switch performs a similar function as a bridge, but in a more granular way, and for many more ports than bridges support. Gigabit Ethernet and Ethernet 10 GbE cannot be deployed without using switches. Network adapters or network interface cards are required to join an end system host to network media and enable it to communicate over the network by assembling and disassembling frames. This is a method for device communication and would not assist with isolating collision domains. The router's other interfaces divide the network into three logical subnetworks. These subnets map to layer 2 segments, each implemented using a switch. Hubs have no configuration options. The technician connects the device to a power source and then connects the network cables for the hosts, becoming part of the network segment served by the hub. References 1.3.3 Data Link Layer Functions
A network administrator is tasked with improving the efficiency of a corporate network that consists of two segments: Segment A, which is heavily utilized by data-intensive applications, and Segment B, which is used primarily for light office work. The administrator notices that when Segment A is under heavy load, it significantly impacts the performance of Segment B. To address this issue, the administrator is considering installing an Ethernet bridge between the two segments. Which should expect after installing an Ethernet bridge between Segment A and Segment B? The Ethernet bridge will prevent traffic from Segment A from impacting the performance of Segment B. The Ethernet bridge will increase the bandwidth available to Segment B. The Ethernet bridge will combine Segment A and Segment B into a single collision domain. The Ethernet bridge will enable Segment A to use IP addresses from Segment B.
Correct Answer: The Ethernet bridge will prevent traffic from Segment A from impacting the performance of Segment B. Explanation The correct answer is that the Ethernet bridge will prevent traffic from Segment A from impacting the performance of Segment B. By installing an Ethernet bridge, the administrator effectively isolates the two segments into separate collision domains. This means that heavy traffic or collisions in Segment A will not impact the performance of Segment B, as the bridge will only forward relevant traffic between the two segments. The Ethernet bridge does not increase the bandwidth available to any segment. It manages traffic between segments but does not add additional bandwidth. The Ethernet bridge does the opposite of combining segments into a single collision domain; it segments the network into separate collision domains, reducing the likelihood of collisions affecting the entire network. An Ethernet bridge operates at the Data Link layer (layer 2) and deals with MAC addresses, not IP addresses. It does not enable segments to use IP addresses from each other; IP address management is a function of layer 3 devices like routers. References 3.2.2 Bridges
What happens when VLANs are configured on a switch? The switch's performance is significantly reduced. The switch divides the network into multiple broadcast domains. The switch can only support legacy network cards. The switch operates in half-duplex mode.
Correct Answer: The switch divides the network into multiple broadcast domains. Explanation When VLANs (Virtual Local Area Networks) are configured on a switch, it divides the network into multiple broadcast domains. This allows for better traffic management and increases network security by segregating different parts of the network at the data link layer. VLANs do not cause the switch to operate in half-duplex mode, support only legacy network cards, or significantly reduce the switch's performance. Configuring VLANs on a switch does not affect its duplex mode. Duplex mode (full or half) is determined by the capability of the switch port and the connected device, not by VLAN configuration. The ability of a switch to support legacy network cards is not influenced by VLAN configuration. Switches can support a variety of devices, including modern and legacy ones, regardless of VLAN settings. Configuring VLANs does not inherently reduce a switch's performance. In fact, by segmenting a network into VLANs, traffic can be more efficiently managed, potentially improving overall network performance by reducing unnecessary broadcast traffic. References 1.3.3 Data Link Layer Functions
What command is used to enter the Global Configuration mode on a Cisco switch? answer do copy running-config startup-config interface GigabitEthernet0/1 enable configure terminal
Correct Answer: configure terminal Explanation The configure terminal command is used to enter the Global Configuration mode from the Privileged EXEC mode. This mode allows the user to make configuration updates to the device. The enable command is used to switch from User EXEC mode to Privileged EXEC mode, not to enter Global Configuration mode. The interface GigabitEthernet0/1 command is incorrect because this command is used to enter the interface configuration mode for a specific interface, not the Global Configuration mode. The do copy running-config startup-config command is incorrect because this command is used to save the current running configuration to the startup configuration from within the configuration mode, not to enter Global Configuration mode. References 1.3.3 Data Link Layer Functions
