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2016 Jun 400-101 Study Guide Questions:
Q481. Refer to the exhibit.
Switch DSW1 should share the same MST region with switch DSW2. Which statement is true?
A. Configure DSW1 with the same version number, and VLAN-to-instance mapping as shown on DSW2.
B. Configure DSW1 with the same region name, number, and VLAN-to-instance mapping as shown on DSW2.
C. DSW2 uses the VTP server mode to automatically propagate the MST configuration to DSW1.
D. DSW1 is in VTP client mode with a lower configuration revision number, therefore, it automatically inherits MST configuration from DSW2.
E. DSW1 automatically inherits MST configuration from DSW2 because they have the same domain name.
Q482. Now that we’ve generated the key, our next step would be to configure our vty lines for SSH access and specify which database we are going to use to provide authentication to the device. The local database on the router will do just fine for this example.
LabRouter(config)#line vty 0 4
LabRouter(config-line)#transport input ssh
5. You will need to create an account on the local router’s database to be used for authenticating to the device. This can be accomplished with these commands. LabRouter(config)#username XXXX privilege 15 secret XXXX
Q483. Which statement about BGP and diverse path advertisement is true?
A. The BGP best-path selection must be disabled.
B. The BGP best-path selection algorithm has been changed to always ignore the IGP metric.
C. The BGP best-path selection algorithm has been changed so that two BGP paths can be flagged as best in the BGP table.
D. The BGP best-path selection algorithm has not been changed.
E. The BGP best-path selection is disabled for BGP routes for which the feature is enabled.
The BGP Diverse Path Using a Diverse-Path Route Reflector feature allows BGP to distribute an alternative path other than the best path between BGP speakers when route reflectors are deployed. This additional path is added to the best-path, and the best path algorithm still remains unchanged.
Abreast of the times lpi 101-400:
Q484. Refer to the exhibit.
Why is the loopback 0 interface of R4 missing in the routing table of R2?
A. R2 is configured as a route reflector client.
B. There is no peering between R2 and R3.
C. The next hop is not reachable from R2.
D. The route originated within the same AS.
In the “show ip bgp” output we see that there is no peering session between R2 and R3. Since R3 is the route reflector here, R3 would reflect routes advertised from R4 to R2, but the peer needs to be established first.
Q485. Which statement describes the function of rekey messages?
A. They prevent unencrypted traffic from passing through a group member before registration.
B. They refresh IPsec SAs when the key is about to expire.
C. They trigger a rekey from the server when configuring the rekey ACL.
D. They authenticate traffic passing through a particular group member.
Rekey messages are used to refresh IPsec SAs. When the IPsec SAs or the rekey SAs are about to expire, one single rekey message for a particular group is generated on the key server. No new IKE sessions are created for the rekey message distribution. The rekey messages are distributed by the key server over an existing IKE SA. Rekeying can use multicast or unicast messages.
Q486. Which two statements about MPLS VPNs are true? (Choose two.)
A. PE routers maintain customer routes in the VPN for that customer.
B. They use the explicit-null label by default.
C. P routers are used only for label transit.
D. P routers maintain customer routes in the VPN for that customer.
E. They support only one route target.
F. Each interface on a PE router must have its own VRF.
High value ccie 400-101 book:
Q487. Refer to the exhibit.
Which statement about this COS-DSCP mapping is true?
A. The expedited forwarding DSCP is mapped to COS 3.
B. COS 16 is mapped to DSCP 2.
C. The default COS is mapped to DSCP 32.
D. This mapping is the default COS-DSCP mapping on Cisco switches.
Here we see that COS 3 is mapped to DSCP 46, which is the Expedited forwarding class: The Expedited Forwarding (EF) model is used to provide resources to latency (delay) sensitive real-time, interactive traffic. The EF model uses one marking -- DSCP 46.
Q488. Refer to the exhibit.
If the remaining configuration uses default values, what is the expected output of the show mls qos queue-set command?
A. Exhibit A
B. Exhibit B
C. Exhibit C
D. Exhibit D
mls qos queue-set output qset-idthreshold queue-id drop-threshold1 drop-threshold2 reserved-threshold maximum-threshold
Configure the WTD thresholds, guarantee the availability of buffers, and configure the maximum memory allocation for the queue-set (four egress queues per port).
By default, the WTD thresholds for queues 1, 3, and 4 are set to 100 percent. The thresholds for queue 2 are set to 200 percent. The reserved thresholds for queues 1, 2, 3,
and 4 are set to 50 percent. The maximum thresholds for all queues are set to 400 percent.
. For qset-id , enter the ID of the queue-set specified in Step 2. The range is 1 to 2.
. For queue-id , enter the specific queue in the queue-set on which the command is performed. The range is 1 to 4.
. For drop-threshold1 drop-threshold2 , specify the two WTD thresholds expressed as a percentage of the queue’s allocated memory. Th e range is 1 to 3200 percent.
. For reserved-threshold , enter the amount of memory to be guaranteed (reserved) for the queue expressed as a percentage of the allocated memory. The range is 1 to 100 percent.
. For maximum-threshold , enable a queue in the full condition to obtain more buffers than are reserved for it. This is the maximum memory the queue can have before the packets are dropped if the common pool is not empty. The range is 1 to 3200 percent
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/1 2-2_55_se/configuration/guide/3750xscg/swqos.html
Q489. Refer to the exhibit.
Why is R2 unable to ping the loopback interface of R4?
A. The local preference is too high.
B. The weight is too low.
C. The next hop is not reachable from R2.
D. The route originated from within the same AS.
Before a BGP speaker installs a route to a network in the main IP routing table, the router must know how to reach the next hop that is used to get to that network. Route reachability is verified by searching for a route to the next hop in the main IP routing table. Unlike IGP routing protocols, such as EIGRP and OSPF, which assume that a route is reachable if they learned it through a valid adjacency, BGP does not install routes that it cannot verify as reachable. If a route to the next hop for a BGP network is found in the main IP routing table, BGP assumes that the network is reachable, and that the particular BGP route might be stored in the main IP routing table. If the router receives a route to a network that is not reachable, that route continues to be stored in the incoming BGP table, adj-RIB-In, and might be seen using the show ip bgp command, but is not placed in the main IP routing table.
Q490. What are two benefits of Per-Tunnel QoS for DMVPN? (Choose two.)
A. The administrator can configure criteria that, when matched, can automatically set up QoS for each spoke as it comes online.
B. Traffic from each spoke to the hub can be regulated individually.
C. When traffic exceeds a configurable threshold, the spokes can automatically set up QoS with the hub.
D. The hub can send large packets to a spoke during allotted timeframes.
E. The hub can be regulated to prevent overloading small spokes.
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