network troubleshoots

Question 1

What is the first step in the general troubleshooting process?

Answer 1

Identify the problem: Gather information and identify symptoms

Question 2

What approach involves troubleshooting from the physical layer up to the application layer?

Answer 2

OSI Model approach

Question 3

What are the maximum distance limitations for Cat5e/Cat6 cables?

Answer 3

100 meters (328 feet)

Question 4

What tool can be used to check for cable damage?

Answer 4

Cable testers

Question 5

What indicates a DHCP failure?

Answer 5

APIPA addressing (169.254.x.x)

Question 6

What are the three channels in the 2.4 GHz band that do not overlap?

Answer 6

1, 6, and 11

Question 7

Fill in the blank: The maximum distance for fiber optic cables varies by _______.

Answer 7

type

Question 8

What could cause high ping times in a network?

Answer 8

Network congestion, routing inefficiencies

Question 9

What are common sources of wireless interference?

Answer 9

• Microwave ovens
• Cordless phones
• Bluetooth devices
• Baby monitors
• Wireless security cameras

Question 10

What is the purpose of the ‘ping’ command?

Answer 10

Tests basic connectivity to a host

Question 11

What symptoms indicate a network loop?

Answer 11

• Broadcast storms
• Intermittent connectivity
• High CPU on switches

Question 12

What is a potential cause of port flapping?

Answer 12

Bad cables, duplex mismatches, faulty hardware

Question 13

What should you check if you experience no connectivity?

Answer 13

• Verify physical connections
• Check IP configuration
• Test loopback address

Question 14

What does the command ‘tracert’ do?

Answer 14

Shows the path to a destination

Question 15

What could be a reason for intermittent connectivity?

Answer 15

• Loose cables
• Wireless interference
• Power issues

Question 16

True or False: 5 GHz networks have a longer range but are more susceptible to interference.

Answer 16

False

Question 17

What are the diagnostic tools for checking DNS problems?

Answer 17

• ipconfig /displaydns
• ipconfig /flushdns
• nslookup

Question 18

Fill in the blank: Excessive broadcast traffic flooding the network is known as _______.

Answer 18

broadcast storms

Question 19

What are the causes of electromagnetic interference (EMI)?

Answer 19

• Power cables running parallel to network cables
• Fluorescent lighting fixtures
• Electric motors and generators

Question 20

What is the function of a Wi-Fi analyzer?

Answer 20

Detecting interference, channel usage

Question 21

What issues can arise from using incorrect cable types?

Answer 21

Wrong cable type can lead to connection failures

Question 22

What can cause signal attenuation?

Answer 22

Signal degradation over distance

Question 23

What is QoS in the context of VoIP issues?

Answer 23

Improper traffic prioritization

Question 24

What can lead to DHCP server unavailability?

Answer 24

Server down or unreachable

Question 25

What is the effect of channel congestion?

Answer 25

Too many devices on a single channel

Question 26

What is a common symptom of bandwidth limitations?

Answer 26

Insufficient bandwidth for quality requirements

Question 27

What are the two main types of interference affecting wireless networks?

Answer 27

* Electromagnetic Interference (EMI) * Radio Frequency Interference (RFI)

Question 28

What diagnostic steps should be taken for gateway problems?

Answer 28

* Ping gateway IP * Tracert to external destination

Question 29

What is the significance of using a multimeter in network troubleshooting?

Answer 29

To test electrical connections

Question 30

What might cause auto-channel selection failures in access points?

Answer 30

AP not choosing optimal channel

Question 31

What does the command 'nslookup' do?

Answer 31

Tests DNS resolution

Question 32

Fill in the blank: High-bandwidth applications or users are known as _______.

Answer 32

bandwidth hogs

Question 33

What physical factors can affect wireless signal strength?

Answer 33

* Walls * Floors * Metal objects * Reflective surfaces

Question 34

What is the purpose of using diagnostic commands like 'ipconfig /renew'?

Answer 34

To renew DHCP leases

Question 35

What are common causes of packet loss?

Answer 35

* Overloaded devices * Poor connection quality * Bufferbloat

Question 36

What do you check when troubleshooting authentication failures?

Answer 36

* Incorrect passwords * Unsupported security protocols

Question 37

What issues can arise from incorrect MAC address entries?

Answer 37

MAC filtering problems

Question 38

What is a symptom of duplex mismatches?

Answer 38

Auto-negotiation failures (full vs. half duplex)

Question 39

True or False: The 2.4 GHz band has a shorter range than the 5 GHz band.

Answer 39

False

Question 40

What should be done if there are specific domain resolution failures?

Answer 40

Check DNS settings and cache

Question 41

What are some tools used for network performance testing?

Answer 41

* iperf * speedtest * netstat * bandwidth monitors

Question 42

What does the command 'arp' do?

Answer 42

Displays/modifies ARP address resolution cache

Question 43

What is the function of a network protocol analyzer?

Answer 43

Examining traffic patterns

Question 44

What can cause reduced performance in a VPN?

Answer 44

Encryption overhead, bandwidth constraints

Question 45

Fill in the blank: The presence of multiple physical paths can lead to _______.

Answer 45

network loops

Question 46

What is the role of the Spanning Tree Protocol?

Answer 46

To prevent network loops

Question 47

What is a common troubleshooting step for cloud service connectivity?

Answer 47

Check service status pages

Question 48

What metrics should be analyzed for network diagnostics?

Answer 48

* Packet loss * Latency * Retransmissions * Errors