Networking Concepts

A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?

A network technician is explaining the concept of encapsulation to a junior technician. At which OSI layer does a packet get encapsulated with a source and destination IP address?

A network engineer is designing a new IPv6 addressing scheme. The company has been assigned a /48 prefix and needs to support up to 250 subnets. Which subnet size should be used to minimize waste while meeting the requirement?

A network technician is explaining the difference between a hub and a switch to a junior technician. Which statement correctly describes a key difference between these devices?

A network engineer needs to connect two network segments that use different physical media: one segment uses copper Ethernet and the other uses fiber optic. The device must forward frames based on MAC addresses and must not perform any routing. Which device should the engineer choose?

A network engineer is troubleshooting a communication issue between two hosts. The engineer determines that the data is being segmented at the source and reassembled at the destination, but the segments are arriving out of order. Which OSI layer is responsible for sequencing the segments?

A network technician is explaining the OSI model to a junior technician. The technician mentions that the Transport layer is responsible for end-to-end communication and data segmentation. Which protocol operates at the Transport layer?

Which of the following protocols is used to automatically assign IP addresses to devices on a network?

Which of the following is a characteristic of UDP when compared to TCP?

A network device receives a frame and forwards it based on the destination MAC address. The device does not modify the frame and only floods unknown unicast frames. At which layer of the OSI model does this device operate?

A network device receives a frame on one port and forwards it out to all other ports. The device does not examine the destination MAC address. Which type of device is being described?

A network engineer is designing a network and needs to ensure that broadcast traffic is contained within a single broadcast domain. Which of the following devices should be used to create these separate broadcast domains?

A network administrator wants to segment the network into multiple virtual LANs to reduce broadcast traffic. Which device is required to route traffic between these VLANs?

A network administrator is configuring BGP between two autonomous systems. Which BGP attribute is primarily used to influence inbound traffic to a particular AS?

A network engineer is troubleshooting connectivity issues between two data center switches that are configured to support jumbo frames with an MTU of 9000. The link is a 10 Gigabit Ethernet fiber connection. Large file transfers fail, but small transfers succeed. What is the most likely cause?

Which of the following best describes the function of a default gateway?

A network switch is experiencing a high number of collisions on a specific port. The connected device is configured for half-duplex. Which of the following is the most likely cause?

A router has two routes to the same destination network: one learned via OSPF with a metric of 10, and another learned via EIGRP with a composite metric of 3072. The default administrative distances are OSPF=110, EIGRP=90. Which route will be installed in the routing table?

A network engineer wants to segment a LAN into multiple broadcast domains without purchasing additional hardware. Which of the following technologies should be implemented?

A network administrator needs to ensure that data sent from a host arrives at the correct destination on a different network. Which of the following provides the logical address used for this purpose in IPv4?

A network technician is configuring a small office network with two subnets: 10.0.1.0/24 and 10.0.2.0/24. Each subnet has its own switch, and both switches are connected to a router with interfaces 10.0.1.1 and 10.0.2.1. Hosts on subnet A can ping the router's interface in their subnet but cannot ping hosts on subnet B. Which of the following is the most likely cause?

Which of the following is the primary function of a subnet mask in IPv4 networking?

Which of the following uniquely identifies a hardware network interface on a device?

At which layer of the OSI model does a network device encapsulate data into frames and add source and destination MAC addresses?

Which protocol is used to resolve a known IP address to a corresponding MAC address on a local network?

Which of the following is a characteristic of a Layer 2 network switch?

Which layer of the OSI model is responsible for logical addressing and routing of packets between networks?

Which of the following IP addresses is a private IP address as defined by RFC 1918?

In a network, a collision domain is a network segment where which of the following is true?

At which layer of the OSI model does a device provide flow control, error detection, and recovery for end-to-end communication?

Which of the following network protocols operates at the Transport layer of the OSI model and provides connection-oriented, reliable data delivery?

An IPv6 address has the prefix 2001:db8::/32. Which of the following IP addresses belongs to the same prefix?

Which of the following describes a unicast transmission?

Which of the following IPv6 addresses is a valid link-local address?

Which of the following describes the purpose of a default gateway on a host in a TCP/IP network?

A network technician is explaining the function of a default gateway to a junior technician. Which of the following best describes the purpose of a default gateway?

In the OSI model, which layer is responsible for establishing, managing, and terminating sessions between applications, as well as providing checkpoints and recovery?

A network administrator is configuring IP addresses for a new subnet. The network address is 192.168.1.0 with a subnet mask of 255.255.255.240. How many usable host addresses are available on this subnet?

A network technician is explaining the role of a network switch to a new employee. Which of the following best describes the primary function of a switch in a local area network?

A network engineer is reviewing RFC 1918 address ranges to plan a private IP addressing scheme. Which of the following IP addresses falls within the private address space for Class A?

An engineer is configuring a network and needs to understand the default behavior of an IPv6 node. When an IPv6 interface is initialized, which type of address is automatically assigned without any configuration server?

Which of the following IPv6 addresses is a link-local address?

A network technician is reviewing the OSI model to understand how data is encapsulated when a web request is sent from a client to a server. At which layer does the web browser's HTTP request data get encapsulated with a TCP segment header?

A network technician is explaining the difference between TCP and UDP to a junior technician. Which of the following correctly identifies a characteristic of TCP but NOT of UDP?

A network technician is explaining network segmentation to a junior technician. Which of the following devices increases the number of collision domains but does not increase the number of broadcast domains?

A network technician is explaining the process of resolving Layer 2 addresses to Layer 3 addresses on a local network. Which protocol is used by a host to determine the MAC address of another host given its IP address?

A network engineer needs to create subnets for four departments, each requiring at least 50 host addresses. The available network is 192.168.1.0/24. Which subnet mask should be used to satisfy the requirements while minimizing wasted addresses?

Which of the following best describes the primary function of the transport layer in the OSI model?

A network engineer is designing a subnet to accommodate 50 devices in a single broadcast domain. The engineer uses a /26 subnet mask. How many usable host addresses are available?

A network technician is explaining the difference between connection-oriented and connectionless protocols to a junior technician. Which of the following protocols is connectionless at the transport layer?

A network engineer is designing a network for a large organization. The engineer needs to ensure that broadcast traffic from one VLAN does not propagate to other VLANs while still allowing inter-VLAN communication. Which of the following devices is required to route between VLANs?

Which of the following best describes the purpose of the TCP three-way handshake?

Which of the following best describes the function of a default gateway on a host?

Which of the following best describes the primary difference between a hub and a switch?

At which layer of the OSI model does end-to-end communication and data segmentation occur?

At which layer of the OSI model does logical addressing (e.g., IP addresses) and routing occur?

Which of the following network devices operates at Layer 1 of the OSI model and forwards all incoming electrical signals to all of its ports?

A network administrator wants to automate IP address assignment for client devices. Which protocol should be used?

Which device is used to connect two different network segments and makes forwarding decisions based on IP addresses?

Which transport layer protocol is used by VoIP and streaming video because it provides low latency and does not require retransmission?

A client obtains an IP address from a DHCP server but cannot resolve hostnames. The client can ping the default gateway and external IP addresses successfully. What is the most likely cause?

Which IPv6 address type is used for one-to-many communication and is similar to an IPv4 multicast address?

A client and server are establishing a TCP connection. The client sends a SYN segment to the server. The server responds with a SYN-ACK segment. What is the next segment in the handshake?

Which of the following network devices operates primarily at Layer 2 of the OSI model and uses MAC addresses to forward data?

Which of the following network topologies connects each node to exactly two other nodes, forming a closed loop?

At which layer of the OSI model does a switch that uses MAC addresses to forward frames operate?

Which IPv6 address is reserved for loopback?

Which of the following is a characteristic of a Layer 2 broadcast domain?

A network switch forwards frames based on which address?

Which of the following best describes a broadcast domain?

A network administrator is designing a small office network with 40 workstations. The design must ensure that a single cable failure only affects the connected workstation. Which logical topology should the administrator implement?

At which OSI layer does a router primarily operate to make forwarding decisions based on IP addresses?

Which device operates at Layer 1 (Physical) of the OSI model and regenerates electrical signals to extend the distance of a network segment?

A network administrator has configured a switch with four VLANs: VLAN 10, 20, 30, and 99 (native). The switch is connected to a router via an 802.1Q trunk link. The router has subinterfaces for VLANs 10, 20, and 30, each with an IP address. VLAN 99 is used for management and does not have a router subinterface. How many Layer 3 broadcast domains exist in this network?

A workstation with IP address 10.0.1.5/24 needs to communicate with a server at 10.0.2.10/24. The workstation's default gateway is configured as 10.0.1.1. Which of the following will the workstation do with the IP packets destined for the server?

A network administrator needs to connect 10 workstations in a way that each workstation's traffic does not collide with others. Which device should be used to connect these workstations?

Which of the following network topologies provides the highest level of redundancy and fault tolerance?

Which of the following protocols is used to automatically assign IP addresses to devices on a network and also provides the subnet mask and default gateway?

A network switch that forwards frames based on MAC addresses operates at which layer of the OSI model?

A network has a single switch with VLANs 10, 20, and 30 configured. The switch is connected to a router that has three subinterfaces, each in a different VLAN. How many broadcast domains are present?

Which of the following is a characteristic of UDP?

A network administrator wants to logically segment a single physical switch into multiple separate broadcast domains without purchasing additional hardware. Which concept should be used?

At which layer of the OSI model does the conversion of data frames into electrical signals for transmission occur?

A junior network technician asks which device operates at Layer 2 of the OSI model and uses MAC addresses to forward frames. Which device is the technician describing?

Which network topology connects all devices to a central device?

A network technician is analyzing a small office network topology. An 8-port switch has 7 workstations directly connected. The remaining switch port is connected to a 4-port hub, which has 4 workstations attached. All devices are configured on the same VLAN and IP subnet. How many collision domains and broadcast domains are present in this network?

Match each network protocol to its well-known port number.

Match each network device to its primary function.