By Hutton, Keith
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Additional info for Authorized self-study guide: designing Cisco network service architectures (ARCH)
QoS is needed for these occasions. If congestion is frequently occurring, the design does not have sufficient uplink bandwidth. Figure 2-10. Managing Oversubscription and Bandwidth As access layer bandwidth capacity increases to 1 Gb/s, multiples of 1 Gb/s, and even 10 Gb/s, the bandwidth aggregation on the distribution-to-core uplinks might be supported on many Gigabit Ethernet EtherChannels, on 10 Gigabit Ethernet links, and on 10 Gigabit EtherChannels. Bandwidth Management with EtherChannel As bandwidth from the distribution layer to the core increases, oversubscription to the access layer must be managed, and some design decisions must be made.
1Q-encapsulated packet. 1Q native VLAN, a packet could be crafted that when processed, the first or outermost tag is removed when the packet is switched onto the untagged, native VLAN. When the packet reaches the target switch, the inner or second tag is then processed, and the potentially malicious packet is switched to the target VLAN. The traffic in this attack scenario is in a single direction, and no return traffic can be switched by this mechanism. In addition, this attack cannot work unless the attacker knows the native VLAN identity.
Loop guard*: Prevents an alternate or root port from becoming designated in the absence of BPDUs. Loop guard helps prevent bridging loops that could occur because of a unidirectional link failure on a point-to-point link. Root guard*: Secures the root on a specific switch by preventing external switches from becoming roots. BPDU guard*: When configured on a PortFast-enabled port, BPDU guard shuts down the port that receives a BPDU. Unidirectional Link Detection (UDLD): UDLD monitors the physical configuration of fiber-optic and copper connections and detects when a one-way connection exists.
Authorized self-study guide: designing Cisco network service architectures (ARCH) by Hutton, Keith