N10-009 Networking Concepts Practice Test 4 — 15 Questions

Question 1

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

Accepted Answer

Network layer. The Network layer (Layer 3) is responsible for logical addressing (e.g., IPv4/IPv6 addresses) and routing packets between different networks by determining the best path using routing protocols such as OSPF, BGP, or static routes. Unlike the Data Link layer, which handles physical addressing (MAC) within a single network segment, the Network layer enables end-to-end delivery across multiple hops.

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Data Link layer

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Transport layer

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Application layer

Question 2

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

Accepted Answer

192.168.1.1. (192.168.1.1) is correct because RFC 1918 reserves the 192.168.0.0/16 block (192.168.0.0 – 192.168.255.255) for private use within local networks. This address is not routable on the public internet, making it suitable for internal LAN addressing.

Answer

169.254.1.1

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172.32.1.1

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172.15.1.1

Question 3

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

Accepted Answer

A: Only one device can transmit at a time to avoid data collisions. In a collision domain, only one device can transmit at a time because if two or more devices transmit simultaneously, their signals collide, corrupting the data. This is a fundamental characteristic of half-duplex Ethernet segments, such as those using hubs or legacy bus topologies, where the medium is shared and CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is used to manage access.

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B: All devices share the same IP subnet

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C: Broadcast traffic is confined to that segment

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D: MAC addresses are resolved to IP addresses

Question 4

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

Accepted Answer

A: Transport layer. The Transport layer (Layer 4) is responsible for end-to-end communication between source and destination hosts. It provides flow control (e.g., TCP's sliding window mechanism), error detection (via checksums in TCP and UDP headers), and recovery (through TCP retransmission of lost segments). These functions ensure reliable data delivery across the network, distinguishing it from lower layers that handle hop-by-hop or link-local tasks.

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B: Network layer

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C: Data Link layer

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D: Session layer

Question 5

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

Accepted Answer

TCP. TCP (Transmission Control Protocol) operates at the Transport layer (Layer 4) of the OSI model and provides connection-oriented, reliable data delivery through mechanisms such as three-way handshake, sequence numbers, acknowledgments, and retransmission of lost segments. This ensures that data is delivered in order and without errors, making TCP the correct choice for the question.

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UDP

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IP

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ARP

Question 6

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

Accepted Answer

2001:db8:1::1. The prefix 2001:db8::/32 means the first 32 bits of the address must be 2001:0db8. Option A (2001:db8:1::1) expands to 2001:0db8:0001:0000:0000:0000:0000:0001, which matches the first 32 bits exactly, so it belongs to the same /32 prefix.

Answer

2001:db9::1

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2001:db7::1

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fe80::1

Question 7

Which of the following describes a unicast transmission?

Accepted Answer

One-to-one communication. Unicast transmission is defined as one-to-one communication where a single source sends data to a single destination. In IPv4 networking, this is the standard method for most client-server interactions, such as a host sending an HTTP request to a web server. The destination MAC address in the Ethernet frame is the unique address of the target device, ensuring only that device processes the frame.

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One-to-many communication

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One-to-all communication

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Many-to-many communication

Question 8

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

Accepted Answer

fe80::1. Link-local addresses in IPv6 always start with the prefix fe80::/10, and fe80::1 is a valid example. These addresses are automatically configured on interfaces for local link communication and are not routable beyond the local network segment.

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2001:db8::1

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ff02::1

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10.0.0.1

Question 9

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

Accepted Answer

It forwards traffic from the local network to other networks. The default gateway is the router interface on the local subnet that a host uses to send packets destined for IP addresses outside its own network. When a host determines that the destination IP is not in its local subnet (via its subnet mask), it forwards the frame to the default gateway's MAC address, which then routes the packet toward the remote network. Without a default gateway, a host can only communicate with devices on the same local broadcast domain.

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It translates domain names to IP addresses

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It assigns IP addresses to devices on the network

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It filters traffic to prevent unauthorized access

Question 10

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?

Accepted Answer

It routes traffic from the local network to external networks.. The default gateway is a router or Layer 3 device that serves as the next-hop destination for packets destined to IP addresses outside the local subnet. When a host determines that the destination IP is not on the same network, it forwards the frame to the default gateway's MAC address, which then routes the packet toward the external network. This is defined in RFC 1122 and is essential for any host that needs to communicate beyond its directly connected segment.

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It connects two different VLANs.

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It provides DHCP services to the local network.

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It translates private IP addresses to public IP addresses.

Question 11

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

Accepted Answer

Session layer. The Session layer (Layer 5) of the OSI model is explicitly responsible for establishing, managing, and terminating sessions between applications, as well as providing checkpointing and recovery mechanisms. This layer uses protocols like NetBIOS, RPC, and PPTP to coordinate dialog control, synchronization points, and session restoration after failures, ensuring that long-lived transactions can resume from a checkpoint rather than restarting entirely.

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Transport layer

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Network layer

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Data link layer

Question 12

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?

Accepted Answer

14. The subnet mask 255.255.255.240 (or /28) provides 16 total addresses per subnet. The network address (192.168.1.0) and the broadcast address (192.168.1.15) are reserved, leaving 16 - 2 = 14 usable host addresses. This is calculated as 2^(32-28) - 2 = 2^4 - 2 = 16 - 2 = 14.

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16

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30

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62

Question 13

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?

Accepted Answer

It forwards data based on MAC addresses.. A network switch operates at Layer 2 of the OSI model and uses MAC addresses to make forwarding decisions. When a frame arrives, the switch examines the destination MAC address, looks it up in its MAC address table, and forwards the frame only to the port associated with that address, reducing collision domains and improving network efficiency.

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It forwards data based on IP addresses.

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It connects different networks and performs routing.

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It amplifies and repeats the signal to all ports.

Question 14

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?

Accepted Answer

10.10.10.1. RFC 1918 defines the Class A private address range as 10.0.0.0/8, which includes all addresses from 10.0.0.0 to 10.255.255.255. 10.10.10.1 falls within this range, making it a valid private IP address for internal network use.

Answer

172.16.0.1

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192.168.1.1

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172.32.0.1

Question 15

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?

Accepted Answer

Link-local address. When an IPv6 interface is initialized, it automatically generates a link-local address (fe80::/10) using Stateless Address Autoconfiguration (SLAAC) without requiring any external server (e.g., DHCPv6). This address is mandatory for neighbor discovery and other link-local communication, allowing the node to operate on the local network segment immediately.

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Global unicast address

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Unique local address

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Multicast address