Exam 350-401 topic 1 question 42 discussion

GLBP and MHSRP ------Correct

I'm going for B and C. VRRP - and HSRP suffer from that fact that they both have one primary/master router which provides the _single_ default gateway (single VIP, single virtual MAC) MHSRP provides two Virtual IPs, so end hosts would have to be configured with two default gateways - not common for end hosts. The same concept would apply to multiple VRRP groups. GLBP provides one virtual IP and multiple virtual MAC Addresses; the ARP replies from the Active Virtual Gateway to the hosts will use all the virtual MACs (one for each virtual forwarder) in round robin fashion, so B is correct. which leaves VSS, where both ML Switches form a single virtual switch and no FHRP is required at all to use them both.

A lot of the discussion I’m reading here is making reference to Load Balancing/Sharing as reasons for the answer but the Question doesn’t mention or ask for this. We just need to identify the Technologies that will allow every host to use both Gateways. VRRP & HSRP both present a Virtual IP that will only be present on 1 device at a time, so that would eliminate both. MHSRP, presents 2 VIP’s, with the design idea being that half your users will get 1 VIP the other half the 2nd VIP. Again this would eliminate it as an option. This only leaves GLBP & VSS as our options. GLBP, everyone seems to agree is correct. With VSS, as I understand it, the Switches will be seen as a single logical switch so a Host could communicate with either switch and its data would be passed between the Switches, for forwarding, thereby in my opnion meeting the Question criteria of allowing a Host to use Both Gateways

MHSRP While not as dynamic as GLBP, MHSRP allows for load sharing by assigning different groups of routers to handle traffic for different sets of hosts or VLANs. This way, there is some form of load balancing by manually distributing the traffic between different HSRP groups.

VSS and GLBP are the only two technologies, among the options provided, that offer load balancing and redundancy.

two TECHNOLOGIES, not two FHRP protocols.... BC

MHSRP allows only SINGLE active router for a specific VLAN.

The answers are BD

im going with B & C

B. GLBP - provides gateway redundancy for endpoints and load balancing D. MHSRP - provides gateway redundancy for endpoints and load balances by using multiple HSRP instances. * VSS - I feel this is wrong because the question talks about the distribution layer, where the above FHRPs would be used and VSS is used at the core layer upstream of the where the gateway resides.

I have done a CCNP encore and I do not remember anything as MHSRP, now I see what is it

Think VSS is Active/Standby in terms of Default Gateway placement so client can't really use the Standby box. MHSRP seems more appropriate to me.

Guys, I think the term we're looking for it's load sharing If so: VRRP - does not support load sharing GLBP - support load balancing, thus supports load sharing as well VSS - the question states that there are 2 distinctive switches MHSRP -it does support load sharing HSRP - does not support load sharing Final answer B D

B and C

A & B are the answers. GLBP can serve the traffic of the same vlan (load balance) and VRRP does the same too. VSS would be a good answer but the devbice would need to connect to both switches via echannel

After reviewing carefully, i see this in the question: "A network administrator has designed a network with two multilayer switches on the distribution layer," This it makes me think that he is talking about two separate switches (sw 1 & sw 2)... This is the problem, VSS cannot be a options because is a physical switch that see how one, so I would rule out this option...

VSS makes more sense than "MHSRP". MHSRP is just an administrative load balancing, so "in a VLAN" PCs wouldn's use both gateways. As D is incorrect and you still have to X something, i would go with VSS. This question is faulty.