N10-009 Network Implementation Practice Test 7 — 15 Questions

Question 1

A company is implementing a DMZ to host public-facing web and email servers. The DMZ network uses private IP addresses, and the internal network also uses private IP addresses. The company has only one public IP address assigned to the border router's external interface. Which of the following should be configured to allow internet users to access the DMZ servers?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Port forwarding to the private IP addresses of the servers.. Port forwarding (often configured as static NAT with a single public IP) allows the border router to forward incoming traffic on specific TCP/UDP ports (e.g., 80 for web, 25 for SMTP) to the private IP addresses of the DMZ servers. Since the company has only one public IP, this is the only way to direct external requests to the correct internal server without requiring multiple public IPs.

Answer

NAT with overload to translate multiple internal addresses to the single public IP.

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Static NAT mapping each DMZ server to a unique public IP.

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A VPN tunnel between the DMZ and the internal network.

Question 2

A company wants to increase the bandwidth between two switches without upgrading the existing 1 Gbps copper links. Both switches support 802.3ad. Which technology should be implemented?

Accepted Answer

Link aggregation (LACP). Link aggregation using LACP (802.3ad) allows multiple 1 Gbps copper links to be combined into a single logical link, increasing bandwidth between the two switches without upgrading the physical interfaces. Since both switches support 802.3ad, they can negotiate and manage the aggregated link dynamically, providing both increased throughput and link redundancy.

Answer

VLAN trunking

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Port mirroring

Answer

StackWise

Question 3

A network administrator needs to connect two switches that are 80 meters apart using UTP cabling and achieve 1 Gbps speed. The administrator has Cat5e and Cat6 cables available. Which standard should be used?

Accepted Answer

1000BASE-T. 1000BASE-T (IEEE 802.3ab) is the correct standard because it supports 1 Gbps over Cat5e or Cat6 UTP cabling at distances up to 100 meters. With 80 meters between switches, both cable types are well within the 100-meter reach, and 1000BASE-T is designed specifically for twisted-pair copper at this speed.

Answer

1000BASE-LX

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10GBASE-T

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100BASE-TX

Question 4

A network engineer is configuring a new wireless LAN for a high-density environment such as a conference hall. The engineer needs to minimize co-channel interference. Which of the following should be configured on the access points?

Accepted Answer

Decrease transmit power. In a high-density environment like a conference hall, decreasing transmit power on access points reduces the cell size, which allows for more APs to be placed closer together without their coverage areas overlapping excessively. This minimizes co-channel interference by ensuring that APs on the same channel are physically separated, improving overall throughput and client performance.

Answer

Increase transmit power

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Decrease beacon interval

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Implement channel bonding

Question 5

A network administrator is configuring a trunk link between a switch and a router to support multiple VLANs. The switch's trunk port is set to dot1q encapsulation. Which configuration must match on the router to ensure proper communication?

Accepted Answer

The native VLAN on the router subinterface must be consistent with the switch's native VLAN. The native VLAN on the router subinterface must match the switch's native VLAN to ensure untagged frames are handled consistently. On a dot1q trunk, the native VLAN is the only VLAN whose frames are sent untagged; if the router expects a different native VLAN, it will drop or misclassify those frames, breaking communication for that VLAN.

Answer

The IP address of the router interface must be in the same subnet as the management VLAN

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The subinterface encapsulation must match the switch's native VLAN default

Answer

The router must be configured with inter-VLAN routing static routes

Question 6

A network engineer needs to connect two devices that are 150 meters apart with a 10 Gbps link. Which cabling type is most suitable?

Accepted Answer

Single-mode fiber. Single-mode fiber (SMF) is the correct choice because it supports 10 Gbps transmission over distances well beyond 150 meters, typically up to 10 km or more using 10GBASE-LR optics. In contrast, copper cabling like Cat6a or Cat7 is limited to 100 meters for 10GBASE-T, and multimode fiber (MMF) with 10GBASE-SR is limited to about 300-400 meters depending on the fiber grade (e.g., OM3/OM4), but SMF provides the most reliable and future-proof solution for this distance.

Answer

Cat6a UTP

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Cat7 STP

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Multimode fiber

Question 7

A network engineer needs to connect two buildings that are 200 meters apart with a 1 Gbps link. The path is outdoors and susceptible to lightning strikes. Which cable type is the most appropriate for this scenario?

Accepted Answer

Multimode fiber optic. Multimode fiber optic cable is the most appropriate choice because it supports 1 Gbps over distances up to 550 meters (using OM2/OM3 fiber) and is completely immune to electromagnetic interference (EMI) from lightning strikes. Unlike copper cabling, fiber uses light pulses for transmission, so it does not conduct electricity, making it ideal for outdoor runs between buildings where lightning is a risk.

Answer

Cat6a UTP

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Cat5e UTP

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Single-mode fiber optic

Question 8

A network engineer is installing a WLAN in a warehouse with many metal shelves and racks. During a site survey, the engineer notices significant signal degradation in certain areas. Which wireless propagation phenomenon is most likely causing the issue?

Accepted Answer

Reflection. In a warehouse with many metal shelves and racks, the primary cause of signal degradation is reflection. Metal surfaces act as RF reflectors, causing the wireless signal to bounce off them, which leads to multipath interference and dead zones where the signal cancels out or becomes too weak to be usable. This is a common issue in environments with high metal density, as the reflected waves interfere with the direct path signal.

Answer

Refraction

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Diffraction

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Absorption

Question 9

A company is deploying VoIP phones and wants to ensure voice packets receive priority over data packets on the network. Which technology should be implemented on the switches and routers?

Accepted Answer

Quality of Service (QoS). Quality of Service (QoS) is the correct technology because it allows network devices to classify, mark, and prioritize voice traffic (e.g., using DSCP EF or CoS 5) over data traffic, ensuring low latency, jitter, and packet loss for VoIP. Switches and routers use QoS queuing mechanisms like LLQ or CBWFQ to guarantee bandwidth for voice packets, which is essential for real-time communications.

Answer

VLAN

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Spanning Tree Protocol (STP)

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Power over Ethernet (PoE)

Question 10

A network engineer is planning a wireless LAN for an open office with 50 users. To maximize performance by using multiple non-overlapping channels, which frequency band should be primarily used?

Accepted Answer

5 GHz. The 5 GHz band is the best choice for maximizing performance in an open office with 50 users because it offers up to 23 non-overlapping channels (using 20 MHz channels) compared to only 3 in the 2.4 GHz band. This allows for better channel reuse, reduced co-channel interference, and higher aggregate throughput in a dense user environment.

Answer

2.4 GHz

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6 GHz

Answer

900 MHz

Question 11

A network engineer is configuring a trunk link between two switches to carry VLANs 10, 20, and 30. On Switch A, the port is configured with 'switchport mode trunk' and 'switchport nonegotiate'. On Switch B, the port is left at the default configuration. Which additional configuration is required on Switch B?

Accepted Answer

Manually set the port to trunk mode.. Switch B is left at default configuration, which on most Cisco switches means the port is in dynamic desirable or dynamic auto mode, relying on DTP to negotiate trunking. Since Switch A has 'switchport nonegotiate' configured, it will not send DTP frames, so Switch B will never receive a negotiation trigger and will remain in access mode. Therefore, the port on Switch B must be manually set to trunk mode with 'switchport mode trunk' to establish the trunk link.

Answer

Set the native VLAN to 1.

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Enable DTP on Switch B.

Answer

Configure the allowed VLAN list.

Question 12

Drag and drop the steps for the TCP three-way handshake into the correct order.

Accepted Answer

Step 1: Send SYN, Step 2: Receive SYN-ACK, Step 3: Send ACK. The TCP three-way handshake is a fundamental process for establishing a connection. It begins with the client sending a SYN packet to the server. The server responds with a SYN-ACK packet, acknowledging the client's SYN and sending its own SYN. Finally, the client sends an ACK packet to acknowledge the server's SYN, completing the handshake. This sequence ensures both sides agree on initial sequence numbers and are ready to communicate.

Answer

Step 1: Send SYN, Step 2: Send ACK, Step 3: Receive SYN-ACK

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Step 1: Send SYN-ACK, Step 2: Receive SYN, Step 3: Send ACK

Answer

Step 1: Send ACK, Step 2: Send SYN, Step 3: Receive SYN-ACK

Question 13

Drag and drop the steps in the DHCP lease process (DORA) into the correct order.

Accepted Answer

Discover, Offer, Request, Acknowledge. The DHCP lease process follows the DORA sequence: Discover, Offer, Request, Acknowledge. The client initiates by broadcasting a Discover packet. DHCP servers reply with an Offer containing an IP address. The client then sends a Request to formally accept one offer. Finally, the server sends an Acknowledge to confirm the lease and provide additional configuration parameters. This order ensures proper negotiation and avoids conflicts.

Answer

Discover, Request, Offer, Acknowledge

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Offer, Discover, Request, Acknowledge

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Discover, Offer, Acknowledge, Request

Question 14

Match each OSI layer to its description.

Accepted Answer

Physical Layer: Transmits raw bits over a physical medium.. The correct matches are: Physical layer transmits raw bits, Network layer routes with logical addressing, and Application layer supports user applications. Common confusions involve swapping the roles of Data Link and Transport layers.

Answer

Data Link Layer: Provides end-to-end communication and error recovery.

Answer

Transport Layer: Provides reliable node-to-node communication.

Question 15

Match each network service to its description.

Accepted Answer

DHCP: Automatically assigns IP addresses to devices on a network.. Common network services have specific functions: DHCP assigns IP addresses, DNS resolves names, HTTP serves web content, SMTP handles email, FTP transfers files, and SNMP manages networks. The distractors confuse these roles.

Answer

FTP: Protocol for sending email.

Answer

SNMP: Resolves domain names to IP addresses.