Title: Cisco / CCNA-200-125 / ICND2-200-105
Tags: EIGRP Spanning-Tree

Q: STP
A: Spanning Tree Protocol

Q: What is a Broadcast Storm?
A: Switches endlessly flooding broadcast frames in loop

Q: What causes MAC database instability?
A: Different ports on switch receiving copies of the same frame. Switch will consume resources to keep up with changes in the MAC database.

Acronym: BPDU
Term: Bridge Protocol Data Unit
Definition: STP hello packet that is sent out at configurable intervals to exchange information among bridges in the network.

Acronym: STP
Term: Spanning Tree Protocol
Definition: Provides loop resolution by managing the physical paths to given network segments

Q: What is the standard for IEEE for STP?
A: 802.1D

Q: What are the steps in the STP process
A: - Elects a root bridge
- Elects a root port for each nonroot switch
- Elects a designated port for each segment
- Ports transition to forwarding or blocking state

Acronym: PVST+
Term: Per VLAN Spanning Tree Plus
Definition: A Cisco enhancement of STP that provides a separate 802.1D spanning-tree instance for each VLAN that is configured in the network

Purpose: configures BPDU guard on interface
Command: spanning-tree bpduguard enable
Command Mode: configuration

Q: Define EtherChannel
A: A logical aggregation of multiple Ethernet interfaces used to form a single higher bandwidth routing or bridging endpoint.

Q: What are the protocols for EtherChannel
A: - PAgP is a Cisco proprietary protocol.
- LACP is an IEEE 802.3ad standard.

Q: What interface settings must be matched to create a EtherChannel
A: - Speed and duplex
- Mode (access or trunk)
- Native and allowed VLANs on trunk ports
- Access VLAN on access ports

Q: FHRP
A: First Hop Redundancy Protocol.
A general category of protocols that includes GLBP HSRP and VRRP

Acronym: HSRP
Term: Hot Standby Router Protocol
Definition: Provides high network availability and transparent network topology changes. HSRP creates a hot standby router group with a lead router that services all packets sent to the hot standby address. The lead router is monitored by other routers in the group. If it fails, one of the standby routers inherits both the lead position and the hot standby address.

Acronym: SPAN
Term: Switched Port Analyzer
Definition: Allows traffic received on a port to be copied to be copied to another port. Port mirroring
Other fields (not shown on cards):
Additional Info: Feature available on switches with IOS

Q: What are the features of EIGRP?
A: - Rapid convergence
- Load balancing
- Loop-free, classless routing protocol
- Reduced bandwidth usage
- Bounded updates
- No broadcast

Explain the roles of Successor and Feasible Successor plus Feasible Distance and Advertised Distance in EIRP

Q: What are the four criteria for EIGRP
A: Big Dogs Read Less
- Bandwidth: The smallest bandwidth of all outgoing interfaces between the source and destination, in kilobits.
- Delay: The cumulative (sum) of all interface delay along the path, in tens of microseconds.
- Reliability: This value represents the worst reliability between the source and destination, which is based on keepalives.
- Load: This value represents the worst load on a link between the source and destination, which is computed based on the packet rate and the configured bandwidth of the interface.

Purpose: Display the EIGRP configuration
Command: show running-config | section eigrp
Command Mode: enable

Q: Configure EIGRP
A: Configure routerconf t
router eigrp as_number
network network_number [wildcard_mask]
passive-interface interface
Verity EIGRP neighbors
show ip eigrp interfaces
show ip route
show ip eigrp topology

Acronym: IGP
Term: interior gateway protocol
Definition: Internet protocol used to exchange routing information within an autonomous system.
Other fields (not shown on cards):
Additional Info: Examples of common Internet IGPs include IGRP, OSPF, and RIP.

Q: Define classful routing protocol
A: Uses a major network subnet mask to summarize available networks. Obsolete

Q: Define classless routing protocol
A: Summarization of advertised networks includes subnet information.
Protocols include RIPv2 EIGRP and OSPF

Q: Configure EIGRP ipv6
A: conf t
ipv6 unicast-routing
ipv6 router eigrp 1
no shut
ipv6 eigrp 1
show ipv6 eigrp topology
show ipv6 eigrp neighbors
show ipv6 route eigrp