Evolução do 802.11

Isso aqui além de legal pode te prejudicar não saber, em uma prova como JNCIA, CCNA da vida, é importante conhecer a evolução do padrão 802.11 e suas variantes.


Segue uma imagem que peguei do treinamento da Juniper network fundamentals, que mostra a evolução do 802.11 isso faz parte da evolução e tópicos de wireless exigidos como base do Jncia.


JNCIA JUNIPER – questões interessantes RPD e MDG

Which process is responsible for the routing protocols on a Junos device?

  1. rpd
  2. mgd
  3. dcd
  4. chassisd

Answer: 1

Fonte para pesquisa sobre o rpd, https://www.juniper.net/documentation/en_US/junos/topics/task/verification/rpd-memory-usage.html


Which process is responsible for the configuration of the router and all user commands on a Junos device?

  1. rpd
  2. chassisd
  3. dcd
  4. mgd

Answer: 4

Mais alguns processos que correm nesse caixa top!

Destaque pro mdg que é como um daemon que fica de meio campo falando com os outros processos e caso, alguma requisição pare ele restarta o pedido.





Chassis process


Detects hardware on the system that is used to configure network interfaces.

Monitors the physical status of hardware components and field-replaceable units (FRUs), detecting when environment sensors such as temperature sensors are triggered.

Relays signals and interrupts—for example, when devices are taken offline, so that the system can close sessions and shut down gracefully.

Ethernet switching process


Handles Layer 2 switching functionality such as MAC address learning, Spanning Tree Protocol and access port security. The process is also responsible for managing Ethernet switching interfaces, VLANs, and VLAN interfaces.

Manages Ethernet switching interfaces, VLANs, and VLAN interfaces.

Note: The process is not applicable for EX2300 and EX3400 switches

Forwarding process


Defines how routing protocols operate on the switch. The overall performance of the switch is largely determined by the effectiveness of the forwarding process.

Interface process


Configures and monitors network interfaces by defining physical characteristics such as link encapsulation, hold times, and keepalive timers.

Management process


Provides communication between the other processes and an interface to the configuration database.

Populates the configuration database with configuration information and retrieves the information when queried by other processes to ensure that the system operates as configured.

Interacts with the other processes when commands are issued through one of the user interfaces on the switch.

If a process terminates or fails to start when called, the management process attempts to restart it a limited number of times to prevent thrashing and logs any failure information for further investigation.

Routing protocol process


Defines how routing protocols such as RIP, OSPF, and BGP operate on the device, including selecting routes and maintaining forwarding tables.


Juniper JNCIA, questões básicas, o que o CLI suporta de macros.

• Ctrl+b: Moves the cursor left one character;
• Ctrl+a: Moves the cursor to the beginning of the command line;
• Ctrl+f: Moves the cursor right one character;
• Ctrl+e: Moves the cursor to the end of the command line;
• Delete and Backspace: Deletes the character before the cursor;
• Ctrl+d: Deletes the character over the cursor;
• Ctrl+k: Deletes from the cursor to the end of the line;
• Ctrl+u: Deletes all characters and negates the current command;
• Ctrl+w: Deletes the entire word to the left of the cursor;
• Ctrl+l: Redraws the current line;
• Ctrl+p, Ctrl+n: Repeats the previous and next command in the command history, respectively;
• Esc+d: Deletes the word to the right;
• Esc+b: Moves the cursor back one word with no delete; and
• Esc+f: Moves the cursor forward one word with no delete.