Valid N10-008 Test Answers & CompTIA N10-008 Exam PDF [Q25-Q45]

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Valid N10-008 Test Answers & CompTIA N10-008 Exam PDF

CompTIA N10-008 Certification Real 2021 Mock Exam


CompTIA Network+ Exam Certification Details:

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

 

NEW QUESTION 25
An organization wants to implement a method of centrally managing logins to network services. Which of the following protocols should the organization use to allow for authentication, authorization and auditing?

  • A. MS-CHAP
  • B. RSTP
  • C. RADIUS
  • D. LDAPS

Answer: A

 

NEW QUESTION 26
A network engineer configured new firewalls with the correct configuration to be deployed to each remote branch. Unneeded services were disabled, and all firewall rules were applied successfully. Which of the following should the network engineer perform NEXT to ensure all the firewalls are hardened successfully?

  • A. Ensure an implicit permit rule is enabled
  • B. Use the same complex passwords on all firewalls
  • C. Update the firewalls with current firmware and software
  • D. Configure the log settings on the firewalls to the central syslog server

Answer: C

 

NEW QUESTION 27
A network administrator redesigned the positioning of the APs to create adjacent areas of wireless coverage. After project validation, some users still report poor connectivity when their devices maintain an association to a distanced AP. Which of the following should the network administrator check FIRST?

  • A. Validate the roaming settings on the APs and WLAN clients
  • B. Deactivate the 2.4GHz band on the APS
  • C. Verify that the AP antenna type is correct for the new layout
  • D. Check to see if MU-MIMO was properly activated on the APs

Answer: A

 

NEW QUESTION 28
A network administrator is setting up several loT devices on a new VLAN and wants to accomplish the following
1. Reduce manual configuration on each system
2. Assign a specific IP address to each system
3. Allow devices to move to different switchports on the same VLAN
Which of the following should the network administrator do to accomplish these requirements?

  • A. Implement private VLANs for each device
  • B. Set up a reservation for each device
  • C. Use DHCP exclusions to address each device
  • D. Configure a static IP on each device

Answer: A

 

NEW QUESTION 29
Client devices cannot enter a network, and the network administrator determines the DHCP scope is exhausted. The administrator wants to avoid creating a new DHCP pool. Which of the following can the administrator perform to resolve the issue?

  • A. Reduce the lease time
  • B. Install more switches
  • C. Decrease the number of VLANs
  • D. Install load balancers

Answer: A

 

NEW QUESTION 30
Which of the following is a system that is installed directly on a server's hardware and abstracts the hardware from any guest machines?

  • A. Virtual machine
  • B. Guest QS
  • C. Storage array
  • D. Type 1 hypervisor

Answer: C

 

NEW QUESTION 31
A network technician is installing an analog desk phone for a new receptionist After running a new phone line, the technician now needs to cnmp on a new connector. Which of the following connectors would MOST likely be used in this case?

  • A. DB25
  • B. RJ11
  • C. DB9
  • D. RJ45

Answer: C

 

NEW QUESTION 32
A technician is deploying a low-density wireless network and is contending with multiple types of building materials. Which of the following wireless frequencies would allow for the LEAST signal attenuation?

  • A. 5GHz
  • B. 850MHz
  • C. 900MHZ
  • D. 2.4GHz

Answer: A

 

NEW QUESTION 33
A network technician is reviewing the interface counters on a router interface. The technician is attempting to confirm a cable issue. Given the following information:

Which of the following metrics confirms there is a cabling issue?

  • A. Last cleared
  • B. Giants
  • C. CRCs
  • D. Multicasts
  • E. Number of packets output

Answer: C

 

NEW QUESTION 34
An ARP request is broadcasted and sends the following request.
''Who is 192.168.1.200? Tell 192.168.1.55''
At which of the following layers of the OSI model does this request operate?

  • A. Network
  • B. Application
  • C. Transport
  • D. Session
  • E. Data link

Answer: E

 

NEW QUESTION 35
A user reports being unable to access network resources after making some changes in the office. Which of the following should a network technician do FIRST?

  • A. Reseat the cables into the back of the PC
  • B. Check the system's IP address
  • C. Ask what changes were made
  • D. Do a ping test against the servers

Answer: C

 

NEW QUESTION 36
A local firm has hired a consulting company to clean up its IT infrastructure. The consulting company notices remote printing is accomplished by port forwarding via publicly accessible IPs through the firm's firewall Which of the following would be the MOST appropriate way to enable secure remote printing?

  • A. Telnet
  • B. VPN
  • C. SSH
  • D. SSL

Answer: C

 

NEW QUESTION 37
A network technician was troubleshooting an issue for a user who was being directed to cloned websites that were stealing credentials. The URLs were correct for the websites but an incorrect IP address was revealed when the technician used ping on the user's PC After checking the is setting, the technician found the DNS server address was incorrect Which of the following describes the issue?

  • A. Rogue DHCP server
  • B. DNS poisoning
  • C. Exhausted IP scope
  • D. Misconfigured HSRP

Answer: C

 

NEW QUESTION 38
An engineer is configuring redundant network links between switches. Which of the following should the engineer enable to prevent network stability issues?

  • A. STP
  • B. 802.1Q
  • C. CSMA/CD
  • D. Flow control

Answer: A

 

NEW QUESTION 39
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. WPA2
  • B. EAP-TLS
  • C. TWP-RC4
  • D. CCMP-AES

Answer: B

 

NEW QUESTION 40
Which of the following provides redundancy on a file server to ensure the server is still connected to a LAN even in the event of a port failure on a switch?

  • A. PDUs
  • B. Load balancer
  • C. NIC teaming
  • D. RAID array

Answer: C

 

NEW QUESTION 41
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 42
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 remote management
  • B. Configure a stronger password for access
  • C. Use an out-of-band access method.
  • D. Enable a management access list
  • E. Disable access to unnecessary services.

Answer: D

 

NEW QUESTION 43
Which of the following security devices would be BEST to use to provide mechanical access control to the MDF/IDF?

  • A. A key fob
  • B. A door lock
  • C. An employee badge
  • D. A smart card

Answer: A

 

NEW QUESTION 44
A network technician is investigating an IP phone that does not register in the VoIP system Although it received an IP address, it did not receive the necessary DHCP options The information that is needed for the registration is distributes by the OHCP scope All other IP phones are working properly. Which of the following does the technician need to verify?

  • A. DHCP exhaustion
  • B. Latency
  • C. VLAN mismatch
  • D. Transceiver mismatch

Answer: C

 

NEW QUESTION 45
......


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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