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2021 Mar 300-101 actual test
Q61. Refer to the exhibit. Which statement about the configuration is true?
A. 20 packets are being sent every 30 seconds.
B. The monitor starts at 12:05:00 a.m.
C. Jitter is being tested with TCP packets to port 65051.
D. The packets that are being sent use DSCP EF.
Answer: A
Explanation:
Q62. Which statement about the use of tunneling to migrate to IPv6 is true?
A. Tunneling is less secure than dual stack or translation.
B. Tunneling is more difficult to configure than dual stack or translation.
C. Tunneling does not enable users of the new protocol to communicate with users of the old protocol without dual-stack hosts.
D. Tunneling destinations are manually determined by the IPv4 address in the low-order 32 bits of IPv4-compatible IPv6 addresses.
Answer: C
Explanation:
Using the tunneling option, organizations build an overlay network that tunnels one protocol over the other
by encapsulating IPv6 packets within IPv4 packets and IPv4 packets within IPv6 packets. The advantage of this approach is that the new protocol can work without disturbing the old protocol, thus providing connectivity between users of the new protocol. Tunneling has two disadvantages, as discussed in RFC 6144: Users of the new architecture cannot use the services of the underlying infrastructure.
Tunneling does not enable users of the new protocol to communicate with users of the old protocol without
dual-stack hosts, which negates interoperability.
Reference: http://www.cisco.com/c/en/us/products/
collateral/ios-nx-os-software/enterprise-ipv6- solution/white_paper_c11-676278.html
Q63. Which switching method is used when entries are present in the output of the command show ip cache?
A. fast switching
B. process switching
C. Cisco Express Forwarding switching
D. cut-through packet switching
Answer: A
Explanation:
Fast switching allows higher throughput by switching a packet using a cache created by the initial packet
sent to a particular destination. Destination addresses are stored in the high-speed cache to expedite forwarding. Routers offer better packet-transfer performance when fast switching is enabled. Fast switching is enabled by default on all interfaces that support fast switching.
To display the routing table cache used to fast switch IP traffic, use the "show ip cache" EXEC command.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/12_2/switch/command/reference/fswtch_r/xrfscmd5.ht
ml#wp1038133
Updated 300-101 free practice test:
Q64. What are the three modes of Unicast Reverse Path Forwarding?
A. strict mode, loose mode, and VRF mode
B. strict mode, loose mode, and broadcast mode
C. strict mode, broadcast mode, and VRF mode
D. broadcast mode, loose mode, and VRF mode
Answer: A
Explanation:
Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit
the malicious traffic on an enterprise network. This security feature works by enabling a router to verify the
reachability of the source address in packets being forwarded. This capability can limit the appearance of
spoofed addresses on a network. If the source IP address is not valid, the packet is discarded. Unicast
RPF works in one of three different modes: strict mode, loose mode, or VRF mode. Note that not all
network devices support all three modes of operation. Unicast RPF in VRF mode will not be covered in this
document. When administrators use Unicast RPF in strict mode, the packet must be received on the
interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may
drop legitimate traffic that is received on an interface that was not the router's choice for sending return
traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the
network. When administrators use Unicast RPF in loose mode, the source address must appear in the
routing table. Administrators can change this behavior using the allow-default option, which allows the use
of the default route in the source verification process. Additionally, a packet that contains a source address
for which the return route points to the Null 0 interface will be dropped. An access list may also be
specified that permits or denies certain source addresses in Unicast RPF loose mode. Care must be taken
to ensure that the appropriate Unicast RPF mode (loose or strict) is configured during the deployment of
this feature because it can drop legitimate traffic. Although asymmetric traffic flows may be of concern
when deploying this feature, Unicast RPF loose mode is a scalable option for networks that contain
asymmetric routing paths. Reference: http://www.cisco.com/web/about/security/intelligence/unicastrpf.
html
Q65. Under which condition does UDP dominance occur?
A. when TCP traffic is in the same class as UDP
B. when UDP flows are assigned a lower priority queue
C. when WRED is enabled
D. when ACLs are in place to block TCP traffic
Answer: A
Explanation:
Explanation: Mixing TCP with UDP It is a general best practice to not mix TCP-based traffic with UDPbased
traffic (especially Streaming-Video) within a single service-provider class because of the behaviors
of these protocols during periods of congestion. Specifically, TCP transmitters throttle back flows when
drops are detected. Although some UDP applications have application-level windowing, flow control, and
retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower
transmission rates because of dropping. When TCP flows are combined with UDP flows within a single
service-provider class and the class experiences congestion, TCP flows continually lower their
transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This
effect is called TCP starvation/UDP dominance. TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming-
Video and the class experiences sustained congestion. Even if WRED is enabled on the service-provider
class, the same behavior would be observed because WRED (for the most part) manages congestion only
on TCP-based flows. Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/
WAN_and_MAN/QoS_SRND/QoS- SRND-Book/VPNQoS.html
Topic 2, Layer 2 Technologies
13. Prior to enabling PPPoE in a virtual private dialup network group, which task must be completed?
A. Disable CDP on the interface.
B. Execute the vpdn enable command.
C. Execute the no switchport command.
D. Enable QoS FIFO for PPPoE support.
Answer: B
Explanation:
Enabling PPPoE in a VPDN Group
Perform this task to enable PPPoE in a virtual private dial-up network (VPDN) group.
Restrictions
This task applies only to releases prior to Cisco IOS Release 12.2(13)T.
SUMMARY STEPS
1.enable
2.configure terminal
3.vpdn enable
4.vpdn-group name
5.request-dialin
6.protocol pppoe DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC
mode. Example: · Enter your password if Router> enable prompted. Step 2 configure terminal Enters
global configuration mode. Example: Router# configure terminal Step 3 vpdn enable Enables virtual private
dialup Example: networking. Router(config)# vpdn enable Step 4 vpdn-group name Associates a VPDN
group with a Example: customer or VPDN profile. Router(config)# vpdn-group group1 Step 5 request-dialin
Creates a request-dialin VPDN Example: subgroup. Router(config-vpdn)# request-dialin Step 6 protocol
pppoe Enables the VPDN subgroup to Example: establish PPPoE Router(config-vpdn-req-in)# pro tocol
pppoe
Reference:
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ftpppoec_support_TSD_Island
_of_Content_Chapter.html
Q66. Which three problems result from application mixing of UDP and TCP streams within a network with no QoS? (Choose three.)
A. starvation
B. jitter
C. latency
D. windowing
E. lower throughput
Answer: A,C,E
Explanation:
It is a general best practice not to mix TCP-based traffic with UDP-based traffic (especially
streaming video) within a single service provider class due to the behaviors of these protocols during
periods of congestion. Specifically, TCP transmitters will throttle-back flows when drops have been
detected. Although some UDP applications have application-level windowing, flow control, and
retransmission capabilities, most UDP transmitters are completely oblivious to drops and thus never lower
transmission rates due to dropping. When TCP flows are combined with UDP flows in a single service
provider class and the class experiences congestion, then TCP flows will continually lower their rates,
potentially giving up their bandwidth to drop-oblivious UDP flows. This effect is called TCP-starvation/
UDP-dominance. This can increase latency and lower the overall throughput. TCP-starvation/UDPdominance
likely occurs if (TCP-based) mission-critical data is assigned to the same service provider class
as (UDP-based) streaming video and the class experiences sustained congestion. Even if WRED is
enabled on the service provider class, the same behavior would be observed, as WRED (for the most part)
only affects TCP-based flows. Granted, it is not always possible to separate TCP-based flows from UDPbased
flows, but it is beneficial to be aware of this behavior when making such application-mixing
decisions. Reference: http://www.cisco.com/warp/public/cc/so/neso/vpn/vpnsp/spqsd_wp.htm