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2016 Jun vce 400-101:
Q241. Refer to the exhibit.
What kind of load balancing is done on this router?
A. per-packet load balancing
B. per-flow load balancing
C. per-label load balancing
D. star round-robin load balancing
Here we can see that for the same traffic source/destination pair of 10.0.0.1 to 188.8.131.52 there were a total of 100 packets (shown by second entry without the *) and that the packets were distributed evenly across the three different outgoing interfaces (34, 33, 33 packets, respectively.
Q242. Which two options are two characteristics of the HSRPv6 protocol? (Choose two.)
A. It uses virtual MAC addresses 0005.73a0.0000 through 0005.73a0.0fff.
B. It uses UDP port number 2029.
C. It uses virtual MAC addresses 0005.73a0.0000 through 0005.73a0.ffff.
D. It uses UDP port number 2920.
E. If a link local IPv6 address is used, it must have a prefix.
HSRP IPv6 Virtual MAC Address Range
HSRP IPv6 uses a different virtual MAC address block than does HSRP for IP: 0005.73A0.0000 through 0005.73A0.0FFF (4096 addresses)
HSRP IPv6 UDP Port Number
Port number 2029 has been assigned to HSRP IPv6.
Q243. Which two actions can you take to recover an interface in a errdisable state? (Choose two.)
A. Enable UDLD on the switch.
B. Enable errdisable recovery on the switch.
C. Execute the shutdown command on the interface, followed by the no shutdown command.
D. Remove the related commands from the configuration and reenter them.
E. Enable loop guard on the switch.
Q244. Refer to the exhibit.
Which two statements about this route table are true? (Choose two.)
A. The BGP routes are internal.
B. The OSPF routes with the E2 flag retain the same metric as they leave the router.
C. The OSPF routes with the IA flag have their administrative distances incremented as they leave the router.
D. The BGP routes are external.
E. The OSPF routes with the E2 flag have their metrics incremented as they leave the router.
IBGP routes have an Administrative distance of 200, while EBGP have an AD of 20. Here we see that the BGP routes have an AD value of 200.
With OSPF, external routes fall under two categories, external type 1 and external type 2.
The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. The metric for E2 routes do not change when advertising to other routers.
Q245. Refer to the exhibit.
All switches have default bridge priorities, and originate BPDUs with MAC addresses as indicated. The numbers shown are STP link metrics. Which two ports are forwarding traffic after STP converges? (Choose two.)
A. The port connecting switch SWD with switch SWE
B. The port connecting switch SWG with switch SWF
C. The port connecting switch SWC with switch SWE
D. The port connecting switch SWB with switch SWC
Here, we know SWB to SWC are forwarding because we already identified the blocking port. So for the last correct answer let’s consider what must be done to prevent a switch loop between SWC/SWD/SWE. SWE to SWD will be blocked because SWC has a lower MAC address so it wins the forwarding port. And to look at it further, you could try to further understand what would happen with ports on SWG. Would the ports on SWG try to go through SWE or SWF? SWE has the lower MAC address so the port from SWG to SWE would win the forwarding election. Therefore, answer B could never be correct.
Up to the minute 400-101 vce:
Q246. What is the most efficient way to confirm whether microbursts of traffic are occurring?
A. Monitor the output traffic rate using the show interface command.
B. Monitor the output traffic rate using the show controllers command.
C. Check the CPU utilization of the router.
D. Sniff the traffic and plot the packet rate over time.
Micro-bursting is a phenomenon where rapid bursts of data packets are sent in quick succession, leading to periods of full line-rate transmission that can overflow packet buffers of the network stack, both in network endpoints and routers and switches inside the network. In order to troubleshoot microbursts, you need a packet sniffer that can capture traffic over a long period of time and allow you to analyze it in the form of a graph which displays the saturation points (packet rate during microbursts versus total available bandwidth). You can eventually trace it to the source causing the bursts (e.g. stock trading applications).
Reference: Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 989-994). Kindle Edition.
Q247. DRAG DROP
Drag and drop the EIGRP query condition on the left to the corresponding action taken by the router on the right.
Q248. Refer to the exhibit.
What password will be required to enter privileged EXEC mode on a device with the given configuration?
Q249. DRAG DROP
Drag each AF class on the left to its matching DSCP binary value on the right.
Q250. Refer to the exhibit.
For which reason could a BGP-speaking device in autonomous system 65534 be prevented from installing the given route in its BGP table?
A. The AS number of the BGP is specified in the given AS_PATH.
B. The origin of the given route is unknown.
C. BGP is designed only for publicly routed addresses.
D. The AS_PATH for the specified prefix exceeds the maximum number of ASs allowed.
E. BGP does not allow the AS number 65535.
BGP is considered to be a 'Path Vector' routing protocol rather than a distance vector routing protocol since it utilises a list of AS numbers to describe the path that a packet should take. This list is called the AS_PATH. Loops are prevented because if a BGP speaking router sees it's own AS in the AS_PATH of a route it rejects the route.