Emerging Technologies and SDN for Network+ (N10-009)

A set of flashcards covering key vocabulary related to Emerging Technologies and Software-Defined Networking for Network+ certification preparation.

SDN

Software-Defined Networking; manages networks via software, separates control and data planes for flexibility.

SDN Controller

Central management device in SDN; configures network policies, controls traffic flow, e.g., prioritizes cloud apps.

Control Plane

SDN component; makes decisions (e.g., routing, policies), managed by the controller, misconfigs cause issues.

Data Plane

SDN component; forwards traffic based on control plane rules, misconfigs cause uneven traffic distribution.

Network Virtualization

Creates virtual networks (e.g., VLANs, VMs) on physical hardware; enables multiple networks on one server.

IoT

Internet of Things; connects devices (e.g., smart sensors, cameras) to the internet, often uses 5G for low latency.

5G

Fifth-generation wireless; provides high speed, low latency, supports IoT, high jitter disrupts performance.

Hypervisor

Manages virtual machines (e.g., VMware, Hyper-V); enables virtualization, VLAN mismatches block connectivity.

VLAN

Virtual LAN; segments traffic (e.g., VLAN 60: 192.168.60.0/24), missing SDN rules or hypervisor configs isolate.

Inter-VLAN Routing

Routes traffic between VLANs; missing SDN rules (e.g., VLAN 60 to 5G subnet) block connectivity, enable via controller.

Port 443

TCP port for HTTPS; SDN firewall rules blocking 443 prevent cloud/IoT access, test with telnet.

Port 8883

TCP port for secure MQTT; used by IoT, SDN QoS policies prioritize to reduce 5G packet loss, check with Wireshark.

QoS

Quality of Service; prioritizes traffic (e.g., MQTT on 5G), reduces jitter/latency, configure via SDN controller.

Jitter

Variable packet delay; high jitter (e.g., 45 ms) on 5G causes IoT packet loss, mitigate with SDN QoS.

Packet Loss

Dropped packets; caused by 5G congestion or SDN policy errors, leads to IoT failures, diagnose with Wireshark.

ping

Tests connectivity; e.g., ping to IoT device checks 5G link, fails if SDN rules block traffic.

telnet

Tests port connectivity; e.g., telnet to port 443 checks SDN firewall rules, fails if blocked.

traceroute

Traces packet path; identifies SDN routing failures (e.g., stops at router), used to diagnose VLAN issues.

Wireshark

Packet analyzer; captures traffic (e.g., TCP 443, MQTT 8883), diagnoses retransmissions, packet loss, or jitter.

NMS

Network Management System; monitors bandwidth, jitter (e.g., 90% usage, 45 ms), used for 5G and SDN troubleshooting.

show running-config

Displays device config; checks routing rules, VLANs, confirms SDN policy errors, used in troubleshooting.

show vlan

Displays VLAN configs; confirms VLAN presence (e.g., VLAN 90), used to troubleshoot hypervisor mismatches.

show interface

Shows interface status; confirms uplink issues (e.g., Gi0/0 down), used with SDN connection timeout errors.

show ip route

Displays routing table; confirms missing routes (e.g., for VLAN 100), used to diagnose SDN policy errors.

TCP Retransmissions

Resent packets; indicate network issues (e.g., high 5G latency), seen in Wireshark, fix with SDN QoS.

Connection Timeout

SDN failure; controller can’t reach device (e.g., switch), caused by link issues, fix link and retry policy.

Policy Error

SDN issue; misconfigured control/data plane policies block traffic (e.g., VLAN 70), fix via controller.

Bandwidth Usage

Network load metric; high usage (e.g., 95%) on 5G causes latency, prioritize IoT traffic with SDN QoS.

Logical Diagram

Shows network logic (e.g., VLANs, IPs); used to verify SDN configs, mismatches cause connectivity issues.

5G Subnet

IP range for 5G devices (e.g., 192.168.80.0/24); SDN firewall rules or routing issues block IoT traffic.