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csc chp4 flashcards

topic = generalized forwarding, SDN

QuestionAnswer
what does each router contain a forwarding table / flow table
what do we mean when we say "match plus action abstraction" match bits in arriving packet, take action
what is destination-based forwarding forward based on dest, IP address
what is generalized forwarding many header fields can determine action / many action possible = drop/copy/modify/log packet
what is meant by "flow" in flow table abstraction defined by header field values (in link, network, transport-layer fields)
what is generalized forwarding used for simple packet-handling rules
define "match" in a flow table abstraction pattern values in packet header fields
define "actions" in a flow table abstraction for matched packet drop, forward, modify, matched packet or send matched packet to controller
define "priority" in a flow table abstraction disambiguate overlapping patterns
define "counters" in a flow table abstraction #bytes and #packets
flow table diagram example slide 92
flow table entries example slide 93
what is destination-based forwarding used for IP datagrams destined to IP address 51.6.0.8 should be forwarded to router output port 6
what is firewall used for block (do not forward) all datagrams destined to TCP port 22 (ssh port#) / block (do not forward) all datagrams sent by host 128.119.1.1 - slide 94
how does layer 2 destination-based forwarding layer 2 frames with destination MAC address 22:A7:23:11E1:02 should be forwarded to output port 3 - slide 95 example
regarding openflow abstraction what is match+action abstraction unifies different kinds of devices
what is a "match" in a router longest destination IP prefix
what is a "match" in a switch destination MAC address
what is a "match" in a firewall IP addresses and TCP/UDP port numbers
what is a "match" in a NAT IP address and port
what is a "action" in a router forward out a link
what is a "action" in a switch forward or flood
what is a "action" in a firewall permit or deny
what is a "action" in a NAT rewrite address and port
what can orchestrated tables create a network-wide behaviour
how openflow works example slide 97-98
Created by: NtokozoN
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