[Oct 25, 2021] N10-008 Ultimate Study Guide - PassLeaderVCE [Q63-Q81]

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[Oct 25, 2021] N10-008 Ultimate Study Guide -  PassLeaderVCE

Ultimate Guide to Prepare N10-008 Certification Exam for CompTIA Network+ in 2021


CompTIA Network+ Exam Certification Details:

Duration90 mins
Exam CodeN10-008
Number of Questions90
Sample QuestionsCompTIA Network+ Sample Questions
Exam Price$338 (USD)
Passing Score720 / 900
Schedule ExamCompTIA Marketplace
Pearson VUE
Exam NameCompTIA Certified Network+

 

NEW QUESTION 63
A network technician needs to ensure outside users are unable to telnet into any of the servers at the datacenter. Which of the following ports should be blocked when checking firewall configuration?

  • A. 0
  • B. 1
  • C. 2
  • D. 3
  • E. 4

Answer: B

 

NEW QUESTION 64
A technician is troubleshooting a workstation's network connectivity and wants to confirm which switchport corresponds to the wall jack the PC is using Which of the following concepts would BEST help the technician?

  • A. Change management
  • B. Standard work instructions
  • C. Inventory management
  • D. Consistent labeling
  • E. Network baseline

Answer: D

 

NEW QUESTION 65
A store owner would like to have secure wireless access available for both business equipment and patron use. Which of the following features should be configured to allow different wireless access through the same equipment?

  • A. MIMO
  • B. LTE
  • C. SSID
  • D. TKIP

Answer: C

 

NEW QUESTION 66
A technician is installing a new fiber connection to a network device in a datacenter. The connection from the device to the switch also traverses a patch panel connection. The chain of connections is in the following order:
Device
LC/LC patch cable
Patch panel
Cross-connect fiber cable
Patch panel
LC/LC patch cable
Switch
The connection is not working. The technician has changed both patch cables with known working patch cables. The device had been tested and was working properly before being installed. Which of the following is the MOST likely cause of the issue?

  • A. TX/RX is reversed
  • B. Attenuation is occurring
  • C. An incorrect cable was used
  • D. The device failed during installation

Answer: A

 

NEW QUESTION 67
There are two managed legacy switches running that cannot be replaced or upgraded. These switches do not support cryptographic functions, but they are password protected. Which of the following should a network administrator configure to BEST prevent unauthorized access?

  • A. Disable access to unnecessary services.
  • B. Disable access to remote management
  • C. Use an out-of-band access method.
  • D. Configure a stronger password for access
  • E. Enable a management access list

Answer: E

 

NEW QUESTION 68
A network administrator is configuring a load balancer for two systems. Which of the following must the administrator configure to ensure connectivity during a failover?

  • A. APIPA
  • B. Broadcast IP
  • C. NAT
  • D. VIP
  • E. IPv6 tunneling

Answer: D

 

NEW QUESTION 69
Which of the following would MOST likely be used to review previous upgrades to a system?

  • A. Change management
  • B. System life cycle
  • C. Standard operating procedures
  • D. Business continuity plan

Answer: A

 

NEW QUESTION 70
You are tasked with verifying the following requirements are met in order to ensure network security.
Requirements:
Datacenter
Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage Provide a dedicated server to resolve IP addresses and hostnames correctly and handle port 53 traffic Building A Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage Provide devices to support 5 additional different office users Add an additional mobile user Replace the Telnet server with a more secure solution Screened subnet Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage Provide a server to handle external 80/443 traffic Provide a server to handle port 20/21 traffic INSTRUCTIONS Drag and drop objects onto the appropriate locations. Objects can be used multiple times and not all placeholders need to be filled.
Available objects are located in both the Servers and Devices tabs of the Drag & Drop menu.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

Answer:

Explanation:
Top left subnet - 206.208.134.0/28
Top right subnet - 10.72.63.0/28
Bottom subnet - 192.168.11.0/28
Screened Subnet devices - Web server, FTP server
Building A devices - SSH server top left, workstations on all 5 on the right, laptop on bottom left DataCenter devices - DNS server.

 

NEW QUESTION 71
A network technician is investigating an issue with a desktop that is not connecting to the network. The desktop was connecting successfully the previous day, and no changes were made to the environment. The technician locates the switchport where the device is connected and observes the LED status light on the switchport is not lit even though the desktop is turned on Other devices that arc plugged into the switch are connecting to the network successfully Which of the following is MOST likely the cause of the desktop not connecting?

  • A. Port security
  • B. VLAN mismatch
  • C. Transceiver mismatch
  • D. Duplex mismatch
  • E. Damaged cable

Answer: A

 

NEW QUESTION 72
A network administrator needs to query the NSs for a remote application. Which of the following commands would BEST help the administrator accomplish this task?

  • A. arp
  • B. dig
  • C. hostname
  • D. show interface

Answer: B

 

NEW QUESTION 73
An attacker is attempting to find the password to a network by inputting common words and phrases in plaintext to the password prompt. Which of the following attack types BEST describes this action?

  • A. Rainbow table attack
  • B. Brute-force attack
  • C. Dictionary attack
  • D. Pass-the-hash attack

Answer: C

 

NEW QUESTION 74
A technician wants to install a WAP in the center of a room that provides service in a radius surrounding a radio. Which of the following antenna types should the AP utilize?

  • A. Directional
  • B. Omni
  • C. Parabolic
  • D. Yagi

Answer: B

 

NEW QUESTION 75
A network technician is observing the behavior of an unmanaged switch when a new device is added to the network and transmits dat a. Which of the following BEST describes how the switch processes this information?

  • A. The data is flooded out of every port. including the one on which it came in.
  • B. The data is flooded out of every port, excluding the VLAN where it is located
  • C. The data is flooded out of every port but only in the VLAN where it is located.
  • D. The data is flooded out of every port, except the one on which it came in

Answer: D

 

NEW QUESTION 76
A network engineer is designing a new secure wireless network. The engineer has been given the following requirements:
1 Must not use plaintext passwords
2 Must be certificate based
3. Must be vendor neutral
Which of the following methods should the engineer select?

  • A. CCMP-AES
  • B. TWP-RC4
  • C. WPA2
  • D. EAP-TLS

Answer: D

 

NEW QUESTION 77
Which of the following DNS records works as an alias to another record?

  • A. CNAME
  • B. SOA
  • C. AAAA
  • D. MX

Answer: A

 

NEW QUESTION 78
A customer wants to segregate the traffic between guests on a hypervisor. Which of the following does a technician need to configure to meet the requirement?

  • A. Virtual switches
  • B. Fibre Channel
  • C. NIC teaming
  • D. OSPF routing
  • E. Load balancers

Answer: A

 

NEW QUESTION 79
Which of the following factors should be considered when evaluating a firewall to protect a datacenter's east-west traffic?

  • A. Traffic between VMs running on different hosts
  • B. Replication traffic between an on-premises server and a remote backup facility
  • C. Concurrent connections generated by Internet DDoS attacks
  • D. VPN traffic from remote offices to the datacenter's VMs

Answer: B

 

NEW QUESTION 80
Which of the following routing protocols is used to exchange route information between public autonomous systems?

  • A. OSPF
  • B. EGRIP
  • C. RIP
  • D. BGP

Answer: D

 

NEW QUESTION 81
......


CompTIA N10-008 Exam Syllabus Topics:

TopicDetails

Networking Fundamentals - 24%

Compare and contrast the Open Systems Interconnection (OSI) model layers and encapsulation concepts.- OSI model
  • Layer 1 – Physical
  • Layer 2 – Data link
  • Layer 3 – Network
  • Layer 4 – Transport
  • Layer 5 – Session
  • Layer 6 – Presentation
  • Layer 7 – Application

- Data encapsulation and decapsulation within the OSI model context

  • Ethernet header
  • Internet Protocol (IP) header
  • Transmission Control Protocol (TCP)/User Datagram Protocol (UDP) headers
  • TCP flags
  • Payload
  • Maximum transmission unit (MTU)
Explain the characteristics of network topologies and network types.- Mesh
- Star/hub-and-spoke
- Bus
- Ring
- Hybrid
- Network types and characteristics
  • Peer-to-peer
  • Client-server
  • Local area network (LAN)
  • Metropolitan area network (MAN)
  • Wide area network (WAN)
  • Wireless local area network (WLAN)
  • Personal area network (PAN)
  • Campus area network (CAN)
  • Storage area network (SAN)
  • Software-defined wide area network (SDWAN)
  • Multiprotocol label switching (MPLS)
  • Multipoint generic routing encapsulation (mGRE)

- Service-related entry point

  • Demarcation point
  • Smartjack

- Virtual network concepts

  • vSwitch
  • Virtual network interface card (vNIC)
  • Network function virtualization (NFV)
  • Hypervisor

- Provider links

  • Satellite
  • Digital subscriber line (DSL)
  • Cable
  • Leased line
  • Metro-optical
Summarize the types of cables and connectors and explain which is the appropriate type for a solution.- Copper
  • Twisted pair
    1. Cat 5
    2. Cat 5e
    3. Cat 6
    4. Cat 6a
    5. Cat 7
    6. Cat 8
  • Coaxial/RG-6
  • Twinaxial
  • Termination standards
    1. TIA/EIA-568A
    2. TIA/EIA-568B

- Fiber

  • Single-mode
  • Multimode

- Connector types

  • Local connector (LC), straight tip (ST), subscriber connector (SC), mechanical transfer (MT), registered jack (RJ)
    1. Angled physical contact (APC)
    2. Ultra-physical contact (UPC)
  • RJ11
  • RJ45
  • F-type connector
  • Transceivers/media converters
  • Transceiver type
    1. Small form-factor pluggable (SFP)
    2. Enhanced form-factor pluggable (SFP+)
    3. Quad small form-factor pluggable (QSFP)
    4. Enhanced quad small form-factor pluggable (QSFP+)

- Cable management

  • Patch panel/patch bay
  • Fiber distribution panel
  • Punchdown block
    1. 66
    2. 110
    3. Krone
    4. Bix

- Ethernet standards

  • Copper
    1. 10BASE-T
    2. 100BASE-TX
    3. 1000BASE-T
    4. 10GBASE-T
    5. 40GBASE-T
  • Fiber
    1. 100BASE-FX
    2 .100BASE-SX
    3. 1000BASE-SX
    4. 1000BASE-LX
    5. 10GBASE-SR
    6. 10GBASE-LR
    7. Coarse wavelength division multiplexing (CWDM)
    8. Dense wavelength division multiplexing (DWDM)
    9. Bidirectional wavelength division multiplexing (WDM)
Given a scenario, configure a subnet and use appropriate IP addressing schemes.- Public vs. private
  • RFC1918
  • Network address translation (NAT)
  • Port address translation (PAT)

- IPv4 vs. IPv6

  • Automatic Private IP Addressing (APIPA)
  • Extended unique identifier (EUI-64)
  • Multicast
  • Unicast
  • Anycast
  • Broadcast
  • Link local
  • Loopback
  • Default gateway

- IPv4 subnetting

  • Classless (variable-length subnet mask)
  • Classful
    1. A
    2. B
    3. C
    4. D
    5. E
  • Classless Inter-Domain Routing (CIDR) notation

- IPv6 concepts

  • Tunneling
  • Dual stack
  • Shorthand notation
  • Router advertisement
  • Stateless address autoconfiguration (SLAAC)

- Virtual IP (VIP)
- Subinterfaces

Explain common ports and protocols, their application, and encrypted alternatives.- Protocol sand Ports
  • File Transfer Protocol (FTP) 20/21
  • Secure Shell (SSH) 22
  • Secure File Transfer Protocol (SFTP) 22
  • Telnet 23
  • Simple Mail Transfer Protocol (SMTP) 25
  • Domain Name System (DNS) 53
  • Dynamic Host Configuration Protocol (DHCP) 67/68
  • Trivial File Transfer Protocol (TFTP) 69
  • Hypertext Transfer Protocol (HTTP) 80
  • Post Office Protocol v3 (POP3) 110
  • Network Time Protocol (NTP) 123
  • Internet Message Access Protocol (IMAP) 143
  • Simple Network Management Protocol (SNMP) 161/162
  • Lightweight Directory Access Protocol (LDAP) 389
  • Hypertext Transfer Protocol Secure (HTTPS) [Secure Sockets Layer (SSL)] 443
  • HTTPS [Transport Layer Security (TLS)] 443
  • Server Message Block (SMB) 445
  • Syslog 514
  • SMTP TLS 587
  • Lightweight Directory Access Protocol (over SSL) (LDAPS) 636
  • IMAP over SSL 993
  • POP3 over SSL 995
  • Structured Query Language (SQL) Server 1433
  • SQLnet 1521
  • MySQL 3306
  • Remote Desktop Protocol (RDP) 3389
  • Session Initiation Protocol (SIP) 5060/5061
  • IP protocol types
    1. Internet Control Message Protocol (ICMP)
    2. TCP
    3. UDP
    4. Generic Routing Encapsulation (GRE)
    5. Internet Protocol Security (IPSec)
    - Authentication Header (AH)/Encapsulating Security Payload (ESP)

- Connectionless vs. connection-oriented

Explain the use and purpose of network services.- DHCP
  • Scope
  • Exclusion ranges
  • Reservation
  • Dynamic assignment
  • Static assignment
  • Lease time
  • Scope options
  • Available leases
  • DHCP relay
  • IP helper/UDP forwarding

- DNS

  • Record types
    1. Address (A vs. AAAA)
    2. Canonical name (CNAME)
    3. Mail exchange (MX)
    4. Start of authority (SOA)
    5. Pointer (PTR)
    6. Text (TXT)
    7. Service (SRV)
    8. Name server (NS)
  • Global hierarchy
    1. Root DNS servers
  • Internal vs. external
  • Zone transfers
  • Authoritative name servers
  • Time to live (TTL)
  • DNS caching
  • Reverse DNS/reverse lookup/forward lookup
  • Recursive lookup/iterative lookup

- NTP

  • Stratum
  • Clients
  • Servers
Explain basic corporate and datacenter network architecture.- Three-tiered
  • Core
  • Distribution/aggregation layer
  • Access/edge

- Software-defined networking

  • Application layer
  • Control layer
  • Infrastructure layer
  • Management plane

- Spine and leaf

  • Software-defined network
  • Top-of-rack switching
  • Backbone

- Traffic flows

  • North-South
  • East-West

- Branch office vs. on-premises datacenter vs. colocation
- Storage area networks

  • Connection types
    1. Fibre Channel over Ethernet (FCoE)
    2. Fibre Channel
    3. Internet Small Computer Systems Interface (iSCSI)
Summarize cloud concepts and connectivity options.- Deployment models
  • Public
  • Private
  • Hybrid
  • Community

- Service models

  • Software as a service (SaaS)
  • Infrastructure as a service (IaaS)
  • Platform as a service (PaaS)
  • Desktop as a service (DaaS)

- Infrastructure as code

  • Automation/orchestration

- Connectivity options

  • Virtual private network (VPN)
  • Private-direct connection to cloud provider

- Multitenancy
- Elasticity
- Scalability
- Security implications

Network Implementations - 19%

Compare and contrast various devices, their features, and their appropriate placement on the network.- Networking devices
  • Layer 2 switch
  • Layer 3 capable switch
  • Router
  • Hub
  • Access point
  • Bridge
  • Wireless LAN controller
  • Load balancer
  • Proxy server
  • Cable modem
  • DSL modem
  • Repeater
  • Voice gateway
  • Media converter
  • Intrusion prevention system (IPS)/intrusion detection system (IDS) device
  • Firewall
  • VPN headend

- Networked devices

  • Voice over Internet Protocol (VoIP) phone
  • Printer
  • Physical access control devices
  • Cameras
  • Heating, ventilation, and air conditioning (HVAC) sensors
  • Internet of Things (IoT)
    1. Refrigerator
    2. Smart speakers
    3. Smart thermostats
    4. Smart doorbells
  • Industrial control systems/supervisory control and data acquisition (SCADA)
Compare and contrast routing technologies and bandwidth management concepts.- Routing
  • Dynamic routing
    1. Protocols [Routing Internet Protocol (RIP), Open Shortest Path First (OSPF), Enhanced Interior Gateway Routing Protocol (EIGRP), Border Gateway Protocol (BGP)]
    2. Link state vs. distance vector vs. hybrid
  • Static routing
  • Default route
  • Administrative distance
  • Exterior vs. interior
  • Time to live

- Bandwidth management

  • Traffic shaping
  • Quality of service (QoS)
Given a scenario, configure and deploy common Ethernet switching features.- Data virtual local area network (VLAN)
- Voice VLAN
- Port configurations
  • Port tagging/802.1Q
  • Port aggregation
    1. Link Aggregation Control Protocol (LACP)
  • Duplex
  • Speed
  • Flow control
  • Port mirroring
  • Port security
  • Jumbo frames
  • Auto-medium-dependent interface crossover (MDI-X)

- Media access control (MAC) address tables
- Power over Ethernet (PoE)/Power over Ethernet plus (PoE+)
- Spanning Tree Protocol
- Carrier-sense multiple access with collision detection (CSMA/CD)
- Address Resolution Protocol (ARP)
- Neighbor Discovery Protocol

Given a scenario, install and configure the appropriate wireless standards and technologies.- 802.11 standards
  • a
  • b
  • g
  • n (WiFi 4)
  • ac (WiFi 5)
  • ax (WiFi 6)

- Frequencies and range

  • 2.4GHz
  • 5GHz

- Channels

  • Regulatory impacts

- Channel bonding
- Service set identifier (SSID)

  • Basic service set
  • Extended service set
  • Independent basic service set (Ad-hoc)
  • Roaming

- Antenna types

  • Omni
  • Directional

- Encryption standards

  • WiFi Protected Access (WPA)/WPA2 Personal [Advanced Encryption Standard (AES)/Temporal Key Integrity Protocol (TKIP)]
  • WPA/WPA2 Enterprise (AES/TKIP)

- Cellular technologies

  • Code-division multiple access (CDMA)
  • Global System for Mobile Communications (GSM)
  • Long-Term Evolution (LTE)
  • 3G, 4G, 5G

- Multiple input, multiple output (MIMO) and multi-user MIMO (MU-MIMO)

Network Operations - 16%

Given a scenario, use the appropriate statistics and sensors to ensure network availability.- Performance metrics/sensors
  • Device/chassis
    1. Temperature
    2. Central processing unit (CPU) usage
    3. Memory
  • Network metrics
    1. Bandwidth
    2. Latency
    3. Jitter

- SNMP

  • Traps
  • Object identifiers (OIDs)
  • Management information bases (MIBs)

- Network device logs

  • Log reviews
    1. Traffic logs
    2. Audit logs
    3. Syslog
  • Logging levels/severity levels

- Interface statistics/status

  • Link state (up/down)
  • Speed/duplex
  • Send/receive traffic
  • Cyclic redundancy checks (CRCs)
  • Protocol packet and byte counts

- Interface errors or alerts

  • CRC errors
  • Giants
  • Runts
  • Encapsulation errors

- Environmental factors and sensors

  • Temperature
  • Humidity
  • Electrical
  • Flooding

- Baselines
- NetFlow data
- Uptime/downtime

Explain the purpose of organizational documents and policies.- Plans and procedures
  • Change management
  • Incident response plan
  • Disaster recovery plan
  • Business continuity plan
  • System life cycle
  • Standard operating procedures

- Hardening and security policies

  • Password policy
  • Acceptable use policy
  • Bring your own device (BYOD) policy
  • Remote access policy
  • Onboarding and offboarding policy
  • Security policy
  • Data loss prevention

- Common documentation

  • Physical network diagram
    1. Floor plan
    2. Rack diagram
    3. Intermediate distribution frame (IDF)/main distribution frame (MDF) documentation
  • Logical network diagram
  • Wiring diagram
  • Site survey report
  • Audit and assessment report
  • Baseline configurations

- Common agreements

  • Non-disclosure agreement (NDA)
  • Service-level agreement (SLA)
  • Memorandum of understanding (MOU)
Explain high availability and disaster recovery concepts and summarize which is the best solution.- Load balancing
- Multipathing
- Network interface card (NIC) teaming
- Redundant hardware/clusters
  • Switches
  • Routers
  • Firewalls

- Facilities and infrastructure support

  • Uninterruptible power supply (UPS)
  • Power distribution units (PDUs)
  • Generator
  • HVAC
  • Fire suppression

- Redundancy and high availability (HA) concepts

  • Cold site
  • Warm site
  • Hot site
  • Cloud site
  • Active-active vs. active-passive
    1. Multiple Internet service providers (ISPs)/diverse paths
    2. Virtual Router Redundancy Protocol (VRRP)/First Hop Redundancy Protocol (FHRP)
  • Mean time to repair (MTTR)
  • Mean time between failure (MTBF)
  • Recovery time objective (RTO)
  • Recovery point objective (RPO)

- Network device backup/restore

  • State
  • Configuration

Network Security - 19%

Explain common security concepts.- Confidentiality, integrity, availability (CIA)
- Threats
  • Internal
  • External

- Vulnerabilities

  • Common vulnerabilities and exposures (CVE)
  • Zero-day

- Exploits
- Least privilege
- Role-based access
- Zero Trust
- Defense in depth

  • Network segmentation enforcement
  • Screened subnet [previously known as demilitarized zone (DMZ)]
  • Separation of duties
  • Network access control
  • Honeypot

- Authentication methods

  • Multifactor
  • Terminal Access Controller Access-Control System Plus (TACACS+)
  • Single sign-on (SSO)
  • Remote Authentication Dial-in User Service (RADIUS)
  • LDAP
  • Kerberos
  • Local authentication
  • 802.1X
  • Extensible Authentication Protocol (EAP)

- Risk Management

  • Security risk assessments
    1. Threat assessment
    2. Vulnerability assessment
    3. Penetration testing
    4. Posture assessment
  • Business risk assessments
    1. Process assessment
    2. Vendor assessment

- Security information and event management (SIEM)

Compare and contrast common types of attacks.- Technology-based
  • Denial-of-service (DoS)/distributed denial-of-service (DDoS)
    1. Botnet/command and control
  • On-path attack (previously known as man-in-the-middle attack)
  • DNS poisoning
  • VLAN hopping
  • ARP spoofing
  • Rogue DHCP
  • Rogue access point (AP)
  • Evil twin
  • Ransomware
  • Password attacks
    1. Brute-force
    2. Dictionary
  • MAC spoofing
  • IP spoofing
  • Deauthentication
  • Malware

- Human and environmental

  • Social engineering
    1. Phishing
    2. Tailgating
    3. Piggybacking
    4. Shoulder surfing
Given a scenario, apply network hardening techniques.- Best practices
  • Secure SNMP
  • Router Advertisement (RA) Guard
  • Port security
  • Dynamic ARP inspection
  • Control plane policing
  • Private VLANs
  • Disable unneeded switchports
  • Disable unneeded network services
  • Change default passwords
  • Password complexity/length
  • Enable DHCP snooping
  • Change default VLAN
  • Patch and firmware management
  • Access control list
  • Role-based access
  • Firewall rules
    1. Explicit deny
    2. Implicit deny

- Wireless security

  • MAC filtering
  • Antenna placement
  • Power levels
  • Wireless client isolation
  • Guest network isolation
  • Preshared keys (PSKs)
  • EAP
  • Geofencing
  • Captive portal

- IoT access considerations

Compare and contrast remote access methods and security implications.- Site-to-site VPN
- Client-to-site VPN
  • Clientless VPN
  • Split tunnel vs. full tunnel

- Remote desktop connection
- Remote desktop gateway
- SSH
- Virtual network computing (VNC)
- Virtual desktop
- Authentication and authorization considerations
- In-band vs. out-of-band management

Explain the importance of physical security.- Detection methods
  • Camera
  • Motion detection
  • Asset tags
  • Tamper detection

- Prevention methods

  • Employee training
  • Access control hardware
    1. Badge readers
    2. Biometrics
  • Locking racks
  • Locking cabinets
  • Access control vestibule (previously known as a mantrap)
  • Smart lockers

- Asset disposal

Network Troubleshooting - 22%

Explain the network troubleshooting methodology.- Identify the problem
  • Gather information
  • Question users
  • Identify symptoms
  • Determine if anything has changed
  • Duplicate the problem, if possible
  • Approach multiple problems individually

- Establish a theory of probable cause

  • Question the obvious
  • Consider multiple approaches
    1. Top-to-bottom/bottom-to-top OSI model
    2. Divide and conquer

- Test the theory to determine the cause

  • If the theory is confirmed, determine the next steps to resolve the problem
  • If the theory is not confirmed, reestablish a new theory or escalate

- Establish a plan of action to resolve the problem and identify potential effects
- Implement the solution or escalate as necessary
- Verify full system functionality and, if applicable, implement preventive measures
- Document findings, actions, outcomes, and lessons learned

Given a scenario, troubleshoot common cable connectivity issues and select the appropriate tools.- Specifications and limitations
  • Throughput
  • Speed
  • Distance

- Cable considerations

  • Shielded and unshielded
  • Plenum and riser-rated

- Cable application

  • Rollover cable/console cable
  • Crossover cable
  • Power over Ethernet

- Common issues

  • Attenuation
  • Interference
  • Decibel (dB) loss
  • Incorrect pinout
  • Bad ports
  • Open/short
  • Light-emitting diode (LED) status indicators
  • Incorrect transceivers
  • Duplexing issues
  • Transmit and receive (TX/RX) reversed
  • Dirty optical cables

- Common tools

  • Cable crimper
  • Punchdown tool
  • Tone generator
  • Loopback adapter
  • Optical time-domain reflectometer (OTDR)
  • Multimeter
  • Cable tester
  • Wire map
  • Tap
  • Fusion splicers
  • Spectrum analyzers
  • Snips/cutters
  • Cable stripper
  • Fiber light meter
Given a scenario, use the appropriate network software tools and commands.- Software tools
  • WiFi analyzer
  • Protocol analyzer/packet capture
  • Bandwidth speed tester
  • Port scanner
  • iperf
  • NetFlow analyzers
  • Trivial File Transfer Protocol (TFTP) server
  • Terminal emulator
  • IP scanner

- Command line tool

  • ping
  • ipconfig/ifconfig/ip
  • nslookup/dig
  • traceroute/tracert
  • arp
  • netstat
  • hostname
  • route
  • telnet
  • tcpdump
  • nmap

- Basic network platform commands

  • show interface
  • show config
  • show route
Given a scenario, troubleshoot common wireless connectivity issues.- Specifications and limitations
  • Throughput
  • Speed
  • Distance
  • Received signal strength indication (RSSI) signal strength
  • Effective isotropic radiated power (EIRP)/power settings

- Considerations

  • Antennas
    1. Placement
    2. Type
    3. Polarization
  • Channel utilization
  • AP association time
  • Site survey

- Common issues

  • Interference
    1. Channel overlap
  • Antenna cable attenuation/signal loss
  • RF attenuation/signal loss
  • Wrong SSID
  • Incorrect passphrase
  • Encryption protocol mismatch
  • Insufficient wireless coverage
  • Captive portal issues
  • Client disassociation issues
Given a scenario, troubleshoot general networking issues.- Considerations
  • Device configuration review
  • Routing tables
  • Interface status
  • VLAN assignment
  • Network performance baselines

- Common issues

  • Collisions
  • Broadcast storm
  • Duplicate MAC address
  • Duplicate IP address
  • Multicast flooding
  • Asymmetrical routing
  • Switching loops
  • Routing loops
  • Rogue DHCP server
  • DHCP scope exhaustion
  • IP setting issues
  • Missing route
  • Low optical link budget
  • Certificate issues
  • Hardware failure
  • Host-based/network-based firewall settings
  • Blocked services, ports, or addresses
  • Incorrect VLAN
  • DNS issues
  • NTP issues
  • BYOD challenges
  • Licensed feature issues
  • Network performance issues

 

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