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U2.3 TCP, Routers, VLAN
Descripción
Nework Security Mapa Mental sobre U2.3 TCP, Routers, VLAN, creado por jjanesko el 08/04/2014.
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nework security
nework security
Mapa Mental por
jjanesko
, actualizado hace más de 1 año
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Creado por
jjanesko
hace más de 10 años
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Resumen del Recurso
U2.3 TCP, Routers, VLAN
TCP vs UDP
TCP
connection oriented
UDP
connectionless
TCP handshake
1. node sends packet with SYN flag set
1.1 receiving node puts entry in its connection-half-open table for sending node
2. receiving node replies with a packet that has both SYN and ACK flags set
3. sending node responds with a packed with the ACK flag set
3.1 receiving node removes entry for sending node from its connection-half-open table
RFC 793
4. parties are ready for communication
Denial of Service
SYN flood attack
1.Attacker sends many SYN packets to receiving node.
2. Receiving node adds requests to half-open-connection table.
3. Attacker does not send ACK packet.
4. Receiving node's table gets full. Cannot process anymore connections.
IP source address can be spoofed for a more effective attack.
router
connects and allows communication between networks
Adjunto:
U2.3 TCP, Routers - Router Diagram
routes packets in one of 3 ways
1. direct delivery of a packet to a directly connected device
2. indirect delivery of a packet by forwarding the packet to a default router
3. next-hop delivery of a packet over a known route by forwarding to the next hop router
Layer 3 device
VLAN
virtual local area network
a switch's ports are split up so that logically there is more than one local area network configured
subnets - VLANs set up on one switch
VLANs are not meant to be a secure means of separating LANs.
network vulnerability summary
ARP spoofing
MAC flooding
SYN floods
IP Spoofing
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