Certifications

CCNP Routing & Switching ROUTE 300-101 Chapters 3 & 4 Notes Part I

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CCNP Routing & Switching ROUTE 300-101 Chapters 3 & 4 Notes:

IPv6 Review:

  • IPv6 Address breakdown
    • 32 hexadecimal numbers
    • 8 quartets
    • 4 hex digits separated by a colon
    • 128-bit IPv6 address
      • Example:
        • FE00:0000:0000:0001:0000:0000:0000:0056

Summary:

With the depletion of IPv4 addresses IPv6 was created to solve that problem.

Progress:

Pages 70 – 87 (1.5 hours)

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CCNP Routing & Switching ROUTE 300-101 Chapters 1 & 2 Notes Part II

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CCNP Routing & Switching ROUTE 300-101 Chapters 1 & 2 Notes:

  • TCP/IP Fundamentals
    • Routing occurs at Layer 3 of the OSI Model
    • Internet protocol (IP) is the primary protocols used to route traffic
      • Today we have the almost exhausted IPv4 and the new IPv6 addressing to chose from to route traffic.
      • At Layer 4 we have the Transport layer, which determines the way traffic is going to flow once it hits layer 3. TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are the two transport layer protocols.
      •  The IP header is where things like type of QoS, TCP/UPD, IPv4/IPv6 are determined.
      • Maximum Transmission Unit – determines the size of the packet being transmitted.
      • ICMP messages – aids in checking networking connectivity
      • Three-Way Handshake – since TCP is a reliable protocol, the 3-way handshake is one of a few items which make this possible. The 3-way handshake allows the source and destination devices to establish a session by which packets are going to be sent.
      • TCP Windowing – Allows each packet to get a sequence number which ensures that all packets are sent & recieved between the sender and receiver. 

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CCNP Routing & Switching ROUTE 300-101 Chapters 1 & 2 Notes Part I

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CCNP Routing & Switching ROUTE 300-101 Chapters 1 & 2 Notes:

  • There is a natural need for routing protocols
    • The use of layer 3 devices
    • Scalability
      • The most common routing protocols used in an enterprise/campus networks are versions or RIP, EIGPR, OSPF
      •  Most common routing protocol used for external/untrust (Internet) networks is BGP
    • There are 3 Routing Protocol Categories
      • Distance Vector (Sends full copy of the routing table at certain interval)
        • Distance-Vectore routing protocols use one of the following approaches to prevent routing loops:
          • Split Horizon – This is when an interface is prevented to advertise a route which it already learned on that interface. 
          • Poison Reverse – This is when an interface receives a route advertisement but then re-advertises the same route out with a metric considered infinite.

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