If Fast Ethernet ports are bundled into an EtherChannel, what is the maximum throughput supported on a Catalyst switch?
D.
Which of these methods distribute traffic over an EtherChannel?
A.
What type of interface represents an EtherChannel as a whole?
A.
Which of the following is not a valid method for EtherChannel load balancing?
B.
How can the EtherChannel load-balancing method be set?
D.
What logical operation is performed to calculate EtherChannel load-balancing as a function of two addresses?
A.
Which one of the following is a valid combination of ports for an EtherChannel?
B.
Which of these is a method for negotiating an EtherChannel?
B.
Which of the following is a valid EtherChannel negotiation mode combination between two switches?
C.
When is PAgP’s “desirable silent” mode useful?
B.
Which of the following EtherChannel mmodes does not send or receive any negotiation frames?
A.
Two computers are the only hosts sending IP data across an EtherChannel between two switches. Several different applications are being used between them. Which of these load-balancing methods would be more likely to use the most links in the EtherChannel?
C.
Which command can be used to see the status of an EtherChannel’s links?
C.
Can Etherchannels can be an access or trunk link or both (not at the same time)?
Either one.
What discriminators can the switch use during traffic distro over an etherchannel link?
1. source IP address, destination IP address, or a combo source and dest IP address.
2. source MAC address, dest MAC address, or combo.
3. source port number, dest port number, or combo.
describe hashing operation for etherchannel load balancing for the following:
a. src-ip
b. dst-ip
c. src-dst-ip
d. src-mac
e. dst-mac
f. src-dst-mac
g. src-port
h. dst-port
i. src-dst-port
a. src-ip bits
b. dst-ip bits
c. src-dst-ip XOR
d. src-mac bits
e. dst-mac bits
f. src-dst-mac XOR
g. src-port bits
h. dst-port bits
i. src-dst-port XOR
what cmd allows you to verify load balancing performance?
show etherchannel port-channel
look at hex "load" values and compare against other ports in the bundle.
what are the 2 link aggregation protocols?
Which one is Cisco proprietary?
PAgP port aggregation protocol cisco proprietary
LACP Link aggregation protocol IEEE 802.3ad (aka 802.3 clause 43)
describe etherchannel negotiation using PAgP.
On. no negotiation packets sent. all ports channeling.
auto. yes to negotiation packets sent, waits to be asked to channel.
desireable. yes to negotiation packets sent, actively asks to form a channel.
describe etherchannel negotiation using LACP.
On. no negotiation packets sent. all ports channeling.
passive. yes to negotiation packets sent, waits to be asked to channel.
active. yes to negotiation packets sent, actively asks to form a channel.
describe the roles in LACP endpoints.
system priority, a 2 byte pri value with 6 byte MAC add. lowest system pri makes decisions about what ports actively participate in the etherchannel.
port priority, a 2 byte pri with a 2 byte port number. low value = high pri. you can have up to 16 potential links, with 8 active. The rest are placed in standby.
