BROCADE IP PRIMER

SummaryYou'll typically need some software running on a server to collect the sFlowdata. While there are a few generally available programs that will do this, Brocadehas included this function in their IronView Network Manager (INM)software. Brocade INM also supports graphs and other reporting functionsbased on the sFlow data. This allows a network administrator to get a reallygood view of what kind of traffic is traversing the network (and how much ofeach kind of traffic).Summary• Internet Protocol (IP) is the Network Layer protocol for TCP/IP— ICMP is a Layer 3 protocol used to send messages between Layer 3IP devices— Ping (or “echo request” and “echo reply”) is a function of ICMP thatallows you to see if a host is active on the network— Address Resolution Protocol (ARP) matches an IP address with aMAC address• Computers (and routers) use binary— A byte is eight bits• IP addresses are divided into Classes— The subnet mask defines what part of the IP address is the networkaddress, and what part is the host address— IP network addresses can be further subdivided into subnets— The subnet mask can be written using CIDR (e.g., 192.168.100.0/24)— CIDR uses the network address followed by a slash (/) and the numberof bits that make up the subnet mask• All IP devices have an ARP table that shows all the IP-address-to-MACaddresstranslations that the host knows about• All IP devices have a routing table which lists a network (including subnetmask), and the IP address of the gateway to that network• Some IP networks are private; they cannot be routed through the Internet• The most common Transport Layer protocols in TCP/IP are TCP and UDP• TCP and UDP use ports to distinguish their services and as a form ofaddressing• TCP and UDP ports from 1 to 1,023 are well-known ports• TCP and UDP use a source port (usually a random number from 1,024 to65,535) and a destination port• TCP is connection-orientedBrocade IP Primer 69