Cisco Catalyst 2940 Cable Guard CABLEGUARD-C2940= Manuale Utente
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administrators or technicians can be provided different levels of authorization, ranging from full configuration capabilities to just
read-only capability.
Q.
How can I prevent unauthorized users from accessing my network?
A.
The Cisco Catalyst 2940 Series supports the IEEE 802.1x standard that works in conjunction with a RADIUS server to authenticate
users as they access a network. This provides port-level security and prevents unauthorized users or intruders from accessing the
network. Cisco’s port security helps ensure the appropriate PC is on the network by limiting access to the port based on the MAC
address.
Q.
How can I prevent users from snooping on their neighbors’ traffic?
A.
The Cisco Private VLAN (PVLAN) Edge feature isolates access ports so that users cannot snoop on traffic going to other users on the
same switch. Any traffic sent on an isolated PVLAN Edge port is directed upstream in the network where it can be filtered using a
router or firewall or monitored with an intrusion detection system before being sent to another PVLAN Edge isolated port.
QUALITY OF SERVICE
Q.
Does the Cisco Catalyst 2940 Series support the appropriate quality of service (QoS) mechanisms to enable voice, video, and
data applications?
A.
Yes, for basic voice, video, and data applications. The switches support four queues per port, allowing network administrators to
choose from four different service levels for each type of network traffic. Using the 802.1p class of service (CoS) value in the packet
header, Cisco Catalyst 2940 Series Switches can place different types of traffic into different prioritized queues. Queue priorities can
be configured using Strict Priority or Weighted Round Robin scheduling. When running voice over the network, it is better to use
Strict Priority scheduling; if there is a mix of video and data applications, Weighted Round Robin scheduling is generally preferred.
Availability
Q.
Does the Cisco Catalyst 2940 Series support Internet Group Management Protocol (IGMP) Snooping?
A.
Yes. IGMP Snooping makes more efficient use of network bandwidth when using multicast applications. In addition, the Cisco
Catalyst 2940 Series supports Immediate Leave processing, which prunes out unnecessary multicast traffic more quickly than standard
multicast leave processing.
Q.
Does the Cisco Catalyst 2940 Series support broadcast storm control?
A.
Yes. The Cisco Catalyst 2940 supports not only broadcast storm control, but also unicast and multicast storm control. This feature
mitigates the impact of faulty network interface cards (NICs) that are sending out massive amounts of unnecessary traffic by blocking
the traffic above a certain threshold, shutting down the port, or alerting a network administrator via a Simple Network Management
Protocol (SNMP) trap.
Q.
Does the Cisco Catalyst 2940 Series support PortFast?
A.
Yes. The Cisco Catalyst 2940 supports PortFast, which allows PCs to connect more quickly to the network when first connected to the
switch, thereby helping to improve user productivity and reduce support calls.
Network Management
Q.
Does the Cisco Catalyst 2940 Series support Cisco Express Setup?
A.
Yes. By pressing the Mode button for two seconds during switch bootup, the switch will enter Express Setup mode. This allows the
user to connect to the switch using Ethernet, launch a Web browser, and complete a single Webpage that provides a basic
configuration for the switch so that it is remotely manageable. After completing Express Setup, the switch can be connected to the
network. This tool is designed for networking novices.