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If the TCP window is opened to its maximum size (65535, not using the window scale
option), this allows a window of 44 1460-byte segments. If the receiver sends an ACK
every 22nd segment the calculation becomes
throughput = 22 x 1460 bytes / (22 x 1538 + 84 bytes) x 10,000,000 bits/sec / 8 buts/byte
= 1,183,667 bytes/sec
This is the theoretical limit, and makes certain assumptions: an ACK sent by the receiver
doesn't collide on the Ethernet with one of the sender's segments; the sender can transmit
two segments with the minimum Ethernet spacing; and the receiver can generate the
ACK within the minimum Ethernet spacing. Despite the optimism in these numbers,
[Wamock 1991] measured a sustained rate of 1,075,000 bytes/sec on an Ethernet, with a
standard multiuser workstation (albeit a fast workstation), which is within 90% of the
Moving to faster networks, such as FDDI (100 Mbits/sec), [Schryver 1993] indicates that
three commercial vendors have demonstrated TCP over FDDI between 80 and 98
Mbits/sec. When even greater bandwidth is available, [Borman 1992] reports up to 781
Mbits/sec between two Cray file:///D|/Documents%20and%20Settings/bigini/Docu.../homenet2run/tcpip/tcp-ip-illustrated/tcp_fut.htm (20 of 20) [12/09/2001 14.47.34] Chapter 25. SNMP: Simple Network Management Protocol SNMP: Simple Network Management
As the number of networks within an organization grows, along with the diversity of systems
comprising this internet (routers from various vendors, hosts with embedded router functionality,
terminal servers, etc.), managing all these systems within a coherent framework becomes important.
This chapter looks at the standards used within the Internet protocol suite for network management.
Network management of a TCP/IP internet consists of network management stations (managers)
communicating with network elements. The network elements can be anything that runs the TCP/IP
protocol suite: hosts, routers, X terminals, terminal servers, printers, and so on. The software in the
network element that runs the management software...
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This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.
- Spring '12