N10-009 Networking Concepts Practice Test 2 — 15 Questions

Question 1

Drag and drop the steps to configure a static route on a network router into the correct order.

Accepted Answer

Step 1: Access the router's configuration mode. Step 2: Define the static route with the destination network, subnet mask, and next hop. Step 3: Verify the route appears in the routing table. Step 4: Save the configuration to persistent storage.. To configure a static route, first access the router's configuration mode, then define the static route with the destination network, subnet mask, and next hop address. After configuration, verify that the route appears in the routing table, and finally save the configuration to persistent storage so it remains after a reboot.

Answer

Step 1: Access the router's configuration mode. Step 2: Verify the route appears in the routing table. Step 3: Define the static route with the destination network, subnet mask, and next hop. Step 4: Save the configuration to persistent storage.

Answer

Step 1: Define the static route with the destination network, subnet mask, and next hop. Step 2: Access the router's configuration mode. Step 3: Verify the route appears in the routing table. Step 4: Save the configuration to persistent storage.

Answer

Step 1: Access the router's configuration mode. Step 2: Save the configuration to persistent storage. Step 3: Define the static route with the destination network, subnet mask, and next hop. Step 4: Verify the route appears in the routing table.

Question 2

Drag and drop the steps to recover a lost router password on a Cisco device into the correct order.

Accepted Answer

1. Interrupt boot sequence, 2. Change configuration register to 0x2142, 3. Reload router, 4. Copy startup-config to running-config, 5. Change enable password, 6. Reset configuration register to 0x2102, 7. Save running-config, 8. Reload router. The provided explanation is too generic and does not justify the specific order of steps, particularly the incorrect sequence of saving the running-config before resetting the configuration register to 0x2102. For a successful Cisco password recovery, the configuration register must be reset to 0x2102 in global configuration mode, and *then* the running-config (which now includes the new password and the correct register setting) must be saved to NVRAM. If saved before resetting the register, the router will continue to boot bypassing the startup-config on subsequent reloads.

Answer

1. Interrupt boot sequence, 2. Reload router, 3. Change configuration register to 0x2142, 4. Copy startup-config to running-config, 5. Change enable password, 6. Save running-config, 7. Reset configuration register to 0x2102, 8. Reload router

Answer

1. Change configuration register to 0x2142, 2. Reload router, 3. Interrupt boot sequence, 4. Copy startup-config to running-config, 5. Change enable password, 6. Save running-config, 7. Reset configuration register to 0x2102, 8. Reload router

Answer

1. Change configuration register to 0x2142, 2. Interrupt boot sequence, 3. Reload router, 4. Copy startup-config to running-config, 5. Change enable password, 6. Save running-config, 7. Reset configuration register to 0x2102, 8. Reload router

Question 3

Match each network device to its primary function.

Accepted Answer

Router: Connects multiple networks and routes data packets between them.. The correct matches are: Router → routes between networks, Switch → forwards within a LAN using MAC, Firewall → filters traffic by rules, Access Point → wireless connectivity. Common confusions include mixing router and modem functions, and hub vs switch.

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Modem: Connects multiple networks and routes data packets between them.

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Hub: Connects devices within a single network and forwards data based on MAC addresses.

Question 4

A network administrator is configuring a switch that will connect to a router and several access points. The administrator needs to ensure that the switch ports carrying traffic for multiple VLANs can pass frames for all VLANs while keeping broadcast domains separate. The administrator also wants to reduce manual configuration on the switch. Which two actions should the administrator take? (Choose two.)

Accepted Answer

Configure the switch ports connected to the router and access points as trunk ports.. To pass traffic for multiple VLANs between a switch, router, and access points, the links must be configured as trunks using 802.1Q encapsulation. Trunk ports tag frames with VLAN IDs so that each VLAN's broadcast domain remains separate. VTP can reduce manual VLAN creation across multiple switches, but the scenario involves a single switch and does not require VTP. Native VLAN matching is a best practice but not one of the two required actions.

Answer

Configure the switch ports connected to end-user workstations as access ports in the appropriate VLAN.

Answer

Configure the native VLAN to match on all trunk ports.

Answer

Enable VTP in server mode on the switch to propagate VLAN configurations to other switches.

Question 5

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?

Accepted Answer

Physical layer. The Physical layer (Layer 1) is the correct starting point because the administrator suspects the problem is related to physical cabling. The Physical layer defines the electrical, mechanical, and procedural specifications for transmitting raw bits over a physical medium, such as copper or fiber optic cables. Troubleshooting at this layer involves checking for cable faults, signal degradation, or improper termination before moving up the OSI stack.

Answer

Transport layer

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Data Link layer

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Network layer

Question 6

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?

Accepted Answer

Layer 3. At Layer 3 (the Network layer), the packet is encapsulated with a source and destination IP address. This is defined by the Internet Protocol (IP), which handles logical addressing and routing across networks. The IP header is added to the payload from the upper layers, creating a packet that can be forwarded by routers.

Answer

Layer 2

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Layer 4

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Layer 1

Question 7

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?

Accepted Answer

/56. A /56 subnet provides 256 subnets (2^(56-48) = 2^8 = 256), which meets the requirement of up to 250 subnets with minimal waste. A /48 prefix is the site-level allocation, and using a /56 subnet mask leaves 8 bits for subnetting, offering exactly the needed capacity without over-allocating address space.

Answer

/52

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/64

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/60

Question 8

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?

Accepted Answer

A hub sends frames out all ports except the incoming port; a switch sends frames only to the port with the matching MAC address.. B is correct because a hub operates at Layer 1 (physical layer) and blindly repeats electrical signals out all ports except the incoming port, creating a single collision domain. In contrast, a switch operates at Layer 2 (data link layer) and uses the MAC address table to forward frames only to the specific port associated with the destination MAC address, reducing unnecessary traffic and creating separate collision domains per port.

Answer

A hub operates at Layer 2, while a switch operates at Layer 1.

Answer

A hub uses MAC addresses to make forwarding decisions, while a switch uses IP addresses.

Answer

A hub creates a separate collision domain for each port, while a switch creates a single collision domain.

Question 9

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?

Accepted Answer

Bridge. A bridge operates at Layer 2, forwarding frames based on MAC addresses while connecting different physical media (e.g., copper to fiber). It does not perform routing, making it the correct choice for this scenario. Unlike a media converter, a bridge also provides segmentation and collision domain isolation.

Answer

Layer 3 switch

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Media converter

Answer

Router

Question 10

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?

Accepted Answer

D) Transport layer. The Transport layer (Layer 4) is responsible for end-to-end communication, including segmentation, reassembly, and sequencing of data segments. Protocols like TCP use sequence numbers to order segments correctly at the destination, even if they arrive out of order. This ensures the upper layers receive a complete, ordered data stream.

Answer

A) Physical layer

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B) Data Link layer

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C) Network layer

Question 11

A network technician is assigned a subnet mask of 255.255.255.248. How many usable host addresses are available in this subnet?

Accepted Answer

A) 6. The subnet mask 255.255.255.248 corresponds to a /29 prefix length, which provides 2^(32-29) = 8 total addresses. Subtracting the network address and broadcast address leaves 8 - 2 = 6 usable host addresses.

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B) 8

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C) 14

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D) 30

Question 12

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?

Accepted Answer

TCP. TCP (Transmission Control Protocol) operates at Layer 4 (Transport) of the OSI model, providing reliable, connection-oriented end-to-end communication and data segmentation with sequencing and acknowledgment. It ensures data is delivered error-free and in order, directly fulfilling the described responsibilities.

Answer

IP

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Ethernet

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HTTP

Question 13

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

Accepted Answer

B) DHCP. DHCP (Dynamic Host Configuration Protocol) is the correct answer because it is specifically designed to automatically assign IP addresses and other network configuration parameters (such as subnet mask, default gateway, and DNS servers) to devices on a network. When a client device connects, it sends a DHCP Discover broadcast, and the DHCP server responds with an Offer, followed by a Request and Acknowledgment (DORA process), enabling plug-and-play connectivity.

Answer

A) DNS

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C) ARP

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D) ICMP

Question 14

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

Accepted Answer

C) UDP has lower overhead due to minimal header. UDP (User Datagram Protocol) has a minimal 8-byte header compared to TCP's 20-byte header, resulting in lower overhead and faster transmission. Unlike TCP, UDP does not provide reliability, flow control, or error recovery, making it ideal for real-time applications like VoIP or video streaming where speed is prioritized over guaranteed delivery.

Answer

A) UDP uses sequence numbers for ordering

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B) UDP provides reliable data delivery

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D) UDP requires a three-way handshake to establish a connection

Question 15

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?

Accepted Answer

Layer 2. This device operates at Layer 2 (Data Link Layer) because it forwards frames based on the destination MAC address, does not modify the frame, and floods unknown unicast frames. These behaviors are characteristic of a transparent bridge or switch, which uses a MAC address table to make forwarding decisions without examining IP addresses or modifying the frame. Layer 2 devices do not perform routing or alter the frame's content, distinguishing them from Layer 3 routers.

Answer

Layer 1

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Layer 3

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Layer 4