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Q381. How many hash buckets does Cisco Express Forwarding use for load balancing?
A. 8
B. 16
C. 24
D. 32
Answer: B
Explanation:
In order to understand how the load balance takes place, you must first see how the tables relate. The Cisco Express Forwarding table points to 16 hash buckets (load share table), which point to the adjacency table for parallel paths. Each packet to be switched is broken up into the source and destination address pair and checked against the loadshare table.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/18285-loadbal-cef.html
Q382. Refer to the exhibit.
Which two possible network conditions can you infer from this configuration? (Choose two.)
A. The authentication parameters on R1 and R2 are mismatched.
B. R1 is using the default NTP source configuration.
C. R1 and R2 have established an NTP session.
D. R2 is configured as the NTP master with a stratum of 7.
Answer: A,B
Explanation:
Answer A. The NTP associations are not synced, it is only listed as a candidate because it was configured. Routing is not the issue, so it must be mismatched authentication parameters.
Answer B. NTP sets the source IP address for all NTP packets based on the address of the interface through which the NTP packets are sent. You can configure NTP to use a specific source IP address.
Q383. On a broadcast interface, which two OSPF states support BFD sessions? (Choose two.)
A. DR
B. BDR
C. DROTHER
D. 2WAY
E. FULL
F. ACTIVE
Answer: A,B
Q384. DRAG DROP
Drag each traceroute text character on the left to its meaning on the right.
Answer:
Q385. DRAG DROP
Drag and drop the OSPF network type on the left to the correct traffic type category on the right.
Answer:
Q386. Refer to the exhibit.
Your network is suffering excessive output drops. Which two actions can you take to resolve the problem? (Choose two.)
A. Install a switch with larger buffers.
B. Configure a different queue set.
C. Reconfigure the switch buffers.
D. Configure the server application to use TCP.
E. Update the server operating system.
Answer: A,B
Explanation:
Installing a switch with larger buffers and correctly configuring the buffers can solve output queue problems.
For each queue we need to configure the assigned buffers. The buffer is like the ‘storage’ space for the interface and we have to divide it among the different queues. This is how to do it:
mls qos queue-set output <queue set> buffers Q1 Q2 Q3 Q4
In this example, there is nothing hitting queue 2 or queue 3 so they are not being utilized.
Q387. Which map is locally defined?
A. DSCP-to-DSCP-mutation
B. CoS-to-DSCP
C. IP-precedence-to-DSCP
D. DSCP-to-CoS
Answer: A
Q388. Which two statements about the default SNMP configuration are true? (Choose two.)
A. The SNMP agent is enabled.
B. The SNMP trap receiver is configured.
C. All SNMP notification types are sent.
D. SNMPv1 is the default version.
E. SNMPv3 is the default version.
Answer: C,D
Explanation:
Default SNMP Configuration
Feature
Default Setting
SNMP agent
Enabled SNMP community strings
Read-Only: Public
Read-WritE. Private
Read-Write-all: Secret
SNMP trap receiver
None configured
SNMP traps
None enabled
SNMP version
If no version keyword is present, the default is version 1.
SNMPv3 authentication
If no keyword is entered, the default is the noauth (noAuthNoPriv) security level.
SNMP notification type
If no type is specified, all notifications are sent.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_19_ea1/configuration/guide/2950scg/swsnmp.html
Q389. Which regular expression will match prefixes that originated from AS200?
A. ^$
B. ^200_
C. _200$ D. ^200)
E. _200_
Answer: C
Explanation:
Example on how to deny all prefixes originated in Autonomous System 200
router bgp 100
neighbor 10.1.1.1 remote-as 65535
neighbor 10.1.1.1 route-map map1 in
!
route-map map1 permit 10
match as-path 1
!
ip as-path access-list 5 deny _200$
ip as-path access-list 5 permit .*
Reference: http://www.cisco.com/c/en/us/td/docs/ios/termserv/configuration/guide/12_4t/tsv_12_4t_bo ok/tsv_reg_express.html
Q390. Which two options are reasons to manipulate the delay metric instead of the bandwidth metric for EIGRP routing? (Choose two.)
A. Because the delay metric provides better handling for bursty traffic
B. Because manipulating the bandwidth metric can also affect QoS
C. Because manipulating the bandwidth affects only a particular path
D. Because changes to the delay metric are propagated to all neighbors on a segment
Answer: B,D
Explanation:
Using the bandwidth to influence EIGRP paths is discouraged for two reasons:
. Changing the bandwidth can have impact beyond affecting the EIGRP metrics. For example, quality of service (QoS) also looks at the bandwidth on an interface.
. EIGRP throttles to use 50 percent of the configured bandwidth. Lowering the bandwidth can cause problems like staving EIGRP neighbors from getting hello packets because of the throttling back.
Because changes to the delay metric are propagated to all downstream routers, changing the interface delay parameter is the preferred method of influencing path selection
Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13673-14.html