Network Implementation

424 questions

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A network administrator is transitioning a company's internal services to an IPv6 infrastructure and verifying host configuration parameters and DNS record deployments. Which of the following statements regarding IPv6 addressing syntax rules and deployment mechanisms are correct? (Select TWO.)

Select all that apply

DNS forward lookup zones must utilize AAAA records to map hostnames to 128-bit IPv6 addresses.

Leading zeros within a 16-bit hex field may be suppressed, but a double colon (

::

) can only appear once in an address string.

An IPv6 address can be compressed using multiple double colons, such as

2001::db8::1

, to represent non-contiguous zero fields.

Standard A records are used for IPv6 address resolution by appending a 128-bit subnet prefix to the host IP.

Show answer & explanation

Answer: DNS forward lookup zones must utilize AAAA records to map hostnames to 128-bit IPv6 addresses.; Leading zeros within a 16-bit hex field may be suppressed, but a double colon ( $::$ ) can only appear once in an address string.

Answer

DNS forward lookup zones must use AAAA records to resolve hostnames to 128-bit IPv6 addresses, and RFC 5952 compression rules permit leading zero suppression while restricting double-colon (

::

) usage to at most once per address.

The statements confirming that AAAA records are used for IPv6 hostname resolution and that a double colon (

::

) may only be used once per IPv6 address string are accurate. AAAA records accommodate 128-bit addresses, and restricting

::

to a single occurrence ensures that zero-compression remains completely deterministic during address expansion.

Step-by-Step Solution

Evaluate the DNS record requirements for IPv6 deployment.

Confirm that IPv6 hostname-to-address resolution uses 128-bit AAAA records, whereas 32-bit IPv4 resolution relies on A records.

DNS infrastructure uses distinct record types to handle differing address structures.

Evaluate RFC 5952 IPv6 representation and compression rules.

Verify that leading zeros inside any 4-digit hexadecimal field (hextet) can be dropped, and consecutive all-zero hextets can be replaced by

::

exactly once per address.

::

were used twice, the exact number of zero bits in each missing segment would be impossible to calculate deterministically.

Key Concept

IPv6 Address Syntax Compression & DNS Deployment

Question 422Question →

A network administrator is deploying a $2.4\text{ GHz}$ wireless network across three adjacent zones in an office building. To achieve higher throughput, the administrator originally configured all three access points to use $40\text{ MHz}$ channel bonding. However, client devices in the overlap areas experience frequent packet loss and degraded performance due to adjacent-channel interference. Which configuration change should the administrator implement to resolve the interference while preserving continuous wireless coverage?

Reconfigure all access points to use

20\text{ MHz}

channel width and assign channels 1, 6, and 11.

Maintain

40\text{ MHz}

channel bonding and reassign the access points to channels 1, 3, and 5.

Reconfigure all access points to use

20\text{ MHz}

channel width and assign channels 2, 6, and 10.

Increase the transmission power on all access points while maintaining

40\text{ MHz}

channel bonding.

Show answer & explanation

Answer: Reconfigure all access points to use $20\text{ MHz}$ channel width and assign channels 1, 6, and 11.

Answer

Reconfigure all access points to use

20\text{ MHz}

channel width and assign channels 1, 6, and 11.

In the

2.4\text{ GHz}

Wi-Fi spectrum, there are only three standard non-overlapping channels when using a

20\text{ MHz}

channel width: channels 1, 6, and 11. Enabling

40\text{ MHz}

channel bonding combines two

20\text{ MHz}

channels, which occupies most of the usable spectrum and causes heavy adjacent-channel interference in multi-AP environments. Reconfiguring the access points to a

20\text{ MHz}

channel width and assigning channels 1, 6, and 11 ensures complete frequency isolation between adjacent coverage cells.

Step-by-Step Solution

Analyze the spectral limitations of the

2.4\text{ GHz}

ISM band.

The

2.4\text{ GHz}

band offers approximately

83.5\text{ MHz}

of total spectrum, which supports only three non-overlapping

20\text{ MHz}

channels (channels 1, 6, and 11).

Bonding two

20\text{ MHz}

channels into a

40\text{ MHz}

channel consumes

9

of the

14

available channel slots, making multi-AP deployment without severe interference impossible.

Evaluate the impact of reducing channel width on RF interference.

Decreasing the channel width from

40\text{ MHz}

20\text{ MHz}

reduces the spectral footprint of each access point.

20\text{ MHz}

channel width fits cleanly into the standard non-overlapping channel plan.

Determine the proper non-overlapping channel distribution.

Assign channels 1, 6, and 11 across the three adjacent access points.

This configuration provides discrete frequency separation between neighboring access points, eliminating adjacent-channel interference.

Key Concept

2.4 GHz Channel Bonding Constraints and Non-Overlapping Channel Allocation

Question 423Question →

A network engineer is deploying wireless access points equipped with directional patch antennas along high-ceiling inventory aisles in a logistics warehouse. The objective is to provide clear coverage along narrow aisle corridors while minimizing co-channel interference and signal leakage into adjacent parallel aisles. Which of the following deployment parameters and configuration settings should the engineer implement? (Select TWO.)

Select all that apply

Align the primary radiation beam of directional antennas parallel to the aisle pathways.

Reduce access point transmit power and raise the minimum basic data rate to shrink cell boundaries.

Deploy high-gain omnidirectional antennas on access points above every aisle intersection.

Configure

40\text{ MHz}

channel bonding across all access points operating on the

2.4\text{ GHz}

spectrum.

Assign the same static

2.4\text{ GHz}

channel to access points located in neighboring parallel aisles.

Show answer & explanation

Answer: Align the primary radiation beam of directional antennas parallel to the aisle pathways.; Reduce access point transmit power and raise the minimum basic data rate to shrink cell boundaries.

Answer

The engineer should align directional antenna coverage parallel to the aisle pathways and reduce access point transmit power while increasing minimum basic data rates to limit cell boundary overlap.

Aligning directional antenna radiation beams along aisle pathways directs wireless signals specifically along user movement corridors while minimizing signal leakage into adjacent aisles. Concurrently, lowering access point transmit power and increasing the minimum basic rate restricts cell size boundaries, reducing co-channel interference across neighboring access points.

Step-by-Step Solution

Select and position antenna patterns appropriate for long, narrow warehouse corridors.

Directional patch antennas aligned parallel to the aisles focus RF energy along the path of client movement, preventing signal leakage into adjacent aisles.

Omnidirectional antennas emit RF energy in 360 degrees, causing unnecessary signal bleed across storage racks.

Tune RF coverage cell boundaries to prevent co-channel interference.

Decreasing access point transmit power and elevating the minimum basic rate shrinks the cell footprint and encourages prompt client roaming.

Uncontrolled cell sizes and support for slow legacy rates cause clients to remain connected to distant access points, consuming unnecessary airtime and overlapping with neighboring cells.

Key Concept

Wireless Antenna Selection and Cell Boundary Tuning

Question 424Question →

A network engineer is configuring a newly installed multi-floor wireless deployment for a medical clinic. The deployment must support high-density client access on both the $2.4\text{ GHz}$ and $5\text{ GHz}$ bands while minimizing co-channel and adjacent-channel interference between adjacent access points (APs). Which of the following design and configuration strategies should the engineer implement to fulfill these requirements? (Select TWO.)

Select all that apply

Restrict

2.4\text{ GHz}

radio configurations strictly to non-overlapping channels

1

6

, and

11

using a

20\text{ MHz}

channel bandwidth.

Configure adjacent access points on the

2.4\text{ GHz}

band to use overlapping channels

2

7

, and

12

to balance client connections.

Enable Dynamic Frequency Selection (DFS) channels in the

5\text{ GHz}

spectrum to increase available non-overlapping channels where radar co-existence is permitted.

Enable

80\text{ MHz}

channel bonding across all

2.4\text{ GHz}

radios to maximize wireless data throughput for medical imaging devices.

Assign identical

5\text{ GHz}

channel numbers to all adjacent access points on the same floor to force seamless client roaming.

Show answer & explanation

Answer: Restrict $2.4\text{ GHz}$ radio configurations strictly to non-overlapping channels $1$ , $6$ , and $11$ using a $20\text{ MHz}$ channel bandwidth.; Enable Dynamic Frequency Selection (DFS) channels in the $5\text{ GHz}$ spectrum to increase available non-overlapping channels where radar co-existence is permitted.

Answer

The correct strategies are restricting the 2.4 GHz band to non-overlapping channels 1, 6, and 11 with 20 MHz bandwidth, and enabling Dynamic Frequency Selection (DFS) channels in the 5 GHz spectrum to expand non-overlapping channel capacity.

Restricting 2.4 GHz radios to channels 1, 6, and 11 using 20 MHz channel width ensures that adjacent APs operating on 2.4 GHz do not cause mutual adjacent-channel interference. Additionally, configuring DFS on 5 GHz radios unlocks additional non-overlapping channels (UNII-2 and UNII-2 Extended), dramatically reducing co-channel interference across multi-AP enterprise deployments.

Step-by-Step Solution

Analyze 2.4 GHz channel planning principles

The 2.4 GHz ISM band has 14 sub-channels spaced 5 MHz apart. For 20 MHz channel widths in standard regulatory domains, only channels 1, 6, and 11 do not overlap with one another.

Using overlapping channels (such as 2, 7, 12) or wide channel bonding in 2.4 GHz leads to corrupt packets and performance drops due to adjacent-channel interference.

Evaluate 5 GHz spectrum optimization methods

Dynamic Frequency Selection (DFS) allows access points to use additional 5 GHz spectrum channels (UNII-2 / UNII-2 Extended) provided they automatically monitor and yield to radar signals.

Enabling DFS expands the pool of available non-overlapping 5 GHz channels, mitigating co-channel interference in multi-AP high-density deployments.

Key Concept

Wireless Channel Allocation and Frequency Band Optimization

Estimated Time:1m 30s

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Network Implementation

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