Read the summary and the most important questions on CCIE Written Objectives

• 1 Network Principles

• 1.1.1 IOS and IOS XE

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• What is pre-emptive and non-preemptive scheduling?

  Non-Preemptive scheduling: When a process enters the state of running, the state of that process is not deleted from the scheduler until it finishes its service time.
  
  Preemptive scheduling: The preemptive scheduling is prioritized. The highest priority process should always be the process that is currently utilized.
  
  Preemptive multitasking involves the use of an interrupt mechanism which suspends the currently executing process and invokes a scheduler to determine which process should execute next.

• What is the ESP card?

  Embedded service processor card used for forwarding traffic

• What is the control-plane for ESP cards?

  FECP forwarding engine control processor

• What is the control-plane for SPA?

  IOCP i/o control processor

• What is the command to create an alias for configure?

  
  alias exec c configure terminal
  
  
  show aliases

• 1.1.3.1 Unicast flooding

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• Whatdoes the command mac-address-table unicast-flood {limit kfps} {vlan vlan} {filter timeout | alert|shutdown}?

  Used for unicast flood prevention

• 1.1.3.4 Impact of micro burst

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• What does the command burst threshold [ingress | egress] size max_bytes interval interval_time?

  Configure micro-burst monitoring on an interface level in max_size

• What does the command burst maximum [ingress | egress] burst-count max_bytes?

  Configures the maximum number of bursts allowed within a time interval before generating an interrupt

• 1.1.4 IP operations

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• What is protocol name for protocol numbers 1, 6, 17, 88, 89, 103?

  1 ICMP
  6 TCP
  17 UDP
  88 EIGRP
  89 OSPF
  103 PIM

• What are the IPv4 header field? (13)

  Version
  Internet Header length (IHL)
  DS Field
  Total Packet Length
  Identification (for fragmentation)
  Flags (for fragmentation)
  Fragment offset (for fragmentation)
  TTL
  Protocol
  Header checksum
  Source IP
  Destination IP
  Optional Header field and Padding