#Cisco ios xe packet capture Pc
#Cisco ios xe packet capture mac

Without the capability to select a user session to capture/record or view/hear, investigations into suspicious or harmful events would be hampered by the volume of information captured. The Cisco switch must be configured for authorized users to select a user session to capture. These devices include the switches, routers, and servers in the network. In an enterprise network, devices under administrative control are trusted sources. The Cisco switch must have DHCP snooping for all user VLANs to validate DHCP messages from untrusted sources.

#Cisco ios xe packet capture mac

The Cisco switch must have Unknown Unicast Flood Blocking (UUFB) enabled.ДЄccess layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific ports based on the VLAN number and the destination MAC address of the frame. In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other networking devices using Spanning-Tree Protocol (STP), Dynamic Trunking. The Cisco switch must not have the default VLAN assigned to any host-facing switch ports. The default VLAN (i.e., VLAN 1) is a special VLAN used for control plane traffic such as Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port. The Cisco switch must have the default VLAN pruned from all trunk ports that do not require it. IP Source Guard provides source IP address filtering on a Layer 2 port to prevent a malicious host from impersonating a legitimate host by assuming the legitimate host's IP address. The Cisco switch must have IP Source Guard enabled on all user-facing or untrusted access switch ports. The Cisco switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.ДAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and before forwarding. Spanning Tree Protocol (STP) is implemented on bridges and switches to prevent layer 2 loops when a broadcast domain spans multiple bridges and switches and when redundant links are provisioned to. The Cisco switch must implement Rapid STP where VLANs span multiple switches with redundant links.

In topologies where fiber optic interconnections are used, physical misconnections can occur that allow a link to appear to be up when there is a mismatched set of transmit/receive pairs. The Cisco switch must enable Unidirectional Link Detection (UDLD) to protect against one-way connections. When trunk negotiation is enabled via Dynamic Trunk Protocol (DTP), considerable time can be spent negotiating trunk settings (802.1q or ISL) when a node or interface is restored.

The Cisco switch must have all trunk links enabled statically. It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attacker and as a result gains access to that VLAN as a member. The Cisco switch must have all disabled switch ports assigned to an unused VLAN.

#Cisco ios xe packet capture Pc

The Cisco switch must uniquely identify all network-connected endpoint devices before establishing any connection.Д¬ontrolling LAN access via 802.1x authentication can assist in preventing a malicious user from connecting an unauthorized PC to a switch port to inject or receive data from the network without detection. Findings (MAC III - Administrative Sensitive) Finding ID