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NEW QUESTION: 1
A. Option B
B. Option A
C. Option C
D. Option D
Answer: C
Explanation:
https://aws.amazon.com/elasticmapreduce/faqs/
NEW QUESTION: 2
You are configuring access rules in a Session Border ControllerPeering architecture.
Which two configuration steps are required to allow access only from User Agents (UAs) configured as session agents? (Choose two.)
A. Navigate to the realm-config configuration element and set the addr-prefix parameter to the IP subnet of your trusted User Agent (UA).
B. Navigate to the session-agent configuration element and set the ip-address parameter to the IP subnet of your trusted User Agent (UA).
C. Navigate to the sip-port configuration element and set the allow-anonymous parameter to agents-only.
D. Navigate to the sip-port configuration element and set the allow-anonymous parameter to address-prefix.
E. Navigate to the sip-port configuration element and set the allow-anonymous parameter to all.
Answer: B,D
NEW QUESTION: 3
Which two mechanisms can be used to eliminate Cisco Express Forwarding polarization?
(Choose two.)
A. different hashing inputs at each layer of the network
B. the unique-ID/universal-ID algorithm
C. Cisco Express Forwarding antipolarization
D. alternating cost links
Answer: A,B
Explanation:
This document describes how Cisco Express Forwarding (CEF) polarization can cause suboptimal use of redundant paths to a destination network. CEF polarization is the effect when a hash algorithm chooses a particular path and the redundant paths remain completely unused.
How to Avoid CEF Polarization
Alternate between default (SIP and DIP) and full (SIP + DIP + Layer4 ports) hashing inputs configuration at each layer of the network. Alternate between an even and odd number of ECMP links at each layer of the network.The CEF load-balancing does not depend on how the protocol routes are inserted in the routing table. Therefore, the OSPF routes exhibit the same behavior as EIGRP. In a hierarchical network where there are several routers that perform load-sharing in a row, they all use same algorithm to load-share.
The hash algorithm load-balances this way by default:
1: 1
2: 7-8
-- 3: 1-1-1 4: 1-1-1-2
5: 1-1-1-1-1
6: 1-2-2-2-2-2
7: 1-1-1-1-1-1-1
8: 1-1-1-2-2-2-2-2
The number before the colon represents the number of equal-cost paths. The number after the colon represents the proportion of traffic which is forwarded per path.
This means that:
For two equal cost paths, load-sharing is 46.666%-53.333%, not 50%-50%.
For three equal cost paths, load-sharing is 33.33%-33.33%-33.33% (as expected).
For four equal cost paths, load-sharing is 20%-20%-20%-40% and not 25%-25%-
25%-25%.
---
-
This illustrates that, when there is even number of ECMP links, the traffic is not load-balanced.
Cisco IOS introduced a concept called unique-ID/universal-ID which helps avoid CEF polarization. This algorithm, called the universal algorithm (the default in current Cisco IOS versions), adds a 32-bit router-specific value to the hash function (called the universal ID - this is a randomly generated value at the time of the switch boot up that can can be manually controlled). This seeds the hash function on each router with a unique ID, which ensures that the same source/destination pair hash into a different value on different routers along the path. This process provides a better network-wide load-sharing and circumvents the polarization issue. This unique -ID concept does not work for an even number of equal-cost paths due to a hardware limitation, but it works perfectly for an odd number of equal-cost paths. In order to overcome this problem, Cisco IOS adds one link to the hardware adjacency table when there is an even number of equal-cost paths in order to make the system believe that there is an odd number of equal-cost links.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/116376technote-cef-00.html