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Exam Code: 300-101 (Practice Exam Latest Test Questions VCE PDF)
Exam Name: Implementing Cisco IP Routing
Certification Provider: Cisco
Free Today! Guaranteed Training- Pass 300-101 Exam.
Q11. Refer to the exhibit. The network setup is running the RIP routing protocol. Which two events will occur following link failure between R2 and R3? (Choose two.)
A. R2 will advertise network 192.168.2.0/27 with a hop count of 16 to R1.
B. R2 will not send any advertisements and will remove route 192.168.2.0/27 from its routing table.
C. R1 will reply to R2 with the advertisement for network 192.168.2.0/27 with a hop count of 16.
D. After communication fails and after the hold-down timer expires, R1 will remove the 192.168.2.0/27 route from its routing table.
E. R3 will not accept any further updates from R2, due to the split-horizon loop prevention mechanism.
Q12. Which three items can you track when you use two time stamps with IP SLAs? (Choose three.)
C. packet loss
Q13. A network engineer initiates the ip sla responder tcp-connect command in order to gather statistics for performance gauging. Which type of statistics does the engineer see?
Configuration Examples for IP SLAs TCP Connect Operations The following example shows
how to configure a TCP Connection-oriented operation from Device B to the Telnet port (TCP port 23) of IP
Host 1 (IP address 10.0.0.1), as shown in the "TCP Connect Operation" figure in the "Information About
the IP SLAs TCP Connect Operation" section. The operation is scheduled to start immediately. In this
example, the control protocol is disabled on the source (Device B). IP SLAs uses the control protocol to
notify the IP SLAs responder to enable the target port temporarily. This action allows the responder to reply
to the TCP Connect operation. In this example, because the target is not a Cisco device and a well- known
TCP port is used, there is no need to send the control message. Device A (target device) Configuration
configure terminal ip sla responder tcp-connect ipaddress 10.0.0.1 port 23
www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15- mt-book/ sla_tcp_conn.html
Q14. You have been asked to evaluate how EIGRP is functioning in a customer network.
What percent of R1’s interfaces bandwidth is EIGRP allowed to use?
Q15. You have been asked to evaluate how EIGRP is functioning in a customer network.
Traffic from R1 to R61 s Loopback address is load shared between R1-R2-R4-R6 and R1-R3-R5-R6 paths. What is the ratio of traffic over each path?
Q16. Which three TCP enhancements can be used with TCP selective acknowledgments? (Choose three.)
A. header compression
B. explicit congestion notification
D. time stamps
E. TCP path discovery
F. MTU window
TCP Selective Acknowledgment
The TCP Selective Acknowledgment feature improves performance if multiple packets are lost from one
TCP window of data.
Prior to this feature, because of limited information available from cumulative acknowledgments, a TCP
sender could learn about only one lost packet per-round-trip
time. An aggressive sender could choose to resend packets early, but such re-sent segments might have
already been successfully received.
The TCP selective acknowledgment mechanism helps improve performance. The receiving TCP host
returns selective acknowledgment packets to the sender,
informing the sender of data that has been received. In other words, the receiver can acknowledge packets
received out of order. The sender can then resend only
missing data segments (instead of everything since the first missing packet).
Prior to selective acknowledgment, if TCP lost packets 4 and 7 out of an 8-packet window, TCP would
receive acknowledgment of only packets 1, 2, and 3. Packets
4 through 8 would need to be re-sent. With selective acknowledgment, TCP receives acknowledgment of
packets 1, 2, 3, 5, 6, and 8. Only packets 4 and 7 must be
TCP selective acknowledgment is used only when multiple packets are dropped within one TCP window.
There is no performance impact when the feature is
enabled but not used. Use the ip tcp selective-ack command in global configuration mode to enable TCP
Refer to RFC 2018 for more details about TCP selective acknowledgment.
TCP Time Stamp
The TCP time-stamp option provides improved TCP round-trip time measurements. Because the time
stamps are always sent and echoed in both directions and the time-stamp value in the header is always
changing, TCP header compression will not compress the outgoing packet. To allow TCP header
compression over a serial link, the TCP time-stamp option is disabled. Use the ip tcp timestamp command
to enable the TCP time-stamp option.
TCP Explicit Congestion Notification
The TCP Explicit Congestion Notification (ECN) feature allows an intermediate router to notify end hosts of
impending network congestion. It also provides enhanced support for TCP sessions associated with
applications, such as Telnet, web browsing, and transfer of audio and video data that are sensitive to delay
or packet loss. The benefit of this feature is the reduction of delay and packet loss in data transmissions.
Use the ip tcp ecn command in global configuration mode to enable TCP ECN.
TCP Keepalive Timer
The TCP Keepalive Timer feature provides a mechanism to identify dead connections. When a TCP
connection on a routing device is idle for too long, the device sends a TCP keepalive packet to the peer
with only the Acknowledgment (ACK) flag turned on. If a response packet (a TCP ACK packet) is not
received after the device sends a specific number of probes, the connection is considered dead and the
device initiating the probes frees resources used by the TCP connection. Reference: http://www.cisco.com/
Q17. Which two methods of deployment can you use when implementing NAT64? (Choose two.)
While stateful and stateless NAT64 perform the task of translating IPv4 packets into IPv6 packets and vice
versa, there are important differences. The following
table provides a high-level overview of the most relevant differences.
Table 2. Differences Between Stateless NAT64 and Stateful NAT64
Stateless NAT64 Stateful NAT64
1:1 translation 1:N translation
No conservation of IPv4 address Conserves IPv4 address
Assures end-to-end address Uses address overloading, hence transparency and scalability lacks in endto-
end address transparency
No state or bindings created on the State or bindings are created on every translation unique translation
Requires IPv4-translatable IPv6 No requirement on the nature of IPv6 addresses assignment (mandatory
address assignment requirement)
Requires either manual or DHCPv6 Free to choose any mode of IPv6 based address assignment for IPv6
address assignment viz. Manual, hosts DHCPv6, SLAAC Reference: http://www.cisco.com/c/en/us/
Q18. A network engineer is trying to modify an existing active NAT configuration on an IOS router by using the following command:
(config)# no ip nat pool dynamic-nat-pool 22.214.171.124 126.96.36.199 netmask 255.255.255.0
Upon entering the command on the IOS router, the following message is seen on the console:
%Dynamic Mapping in Use, Cannot remove message or the %Pool outpool in use, cannot destroy
What is the least impactful method that the engineer can use to modify the existing IP NAT configuration?
A. Clear the IP NAT translations using the clear ip nat traffic * " command, then replace the NAT configuration quickly, before any new NAT entries are populated into the translation table due to active NAT traffic.
B. Clear the IP NAT translations using the clear ip nat translation * " command, then replace the NAT configuration quickly, before any new NAT entries are populated into the translation table due to active NAT traffic.
C. Clear the IP NAT translations using the reload command on the router, then replace the NAT configuration quickly, before any new NAT entries are populated into the translation table due to active NAT traffic.
D. Clear the IP NAT translations using the clear ip nat table * " command, then replace the NAT configuration quickly, before any new NAT entries are populated into the translation table due to active NAT traffic.
Q19. Refer to the exhibit. After configuring GRE between two routers running OSPF that are connected to each other via a WAN link, a network engineer notices that the two routers cannot establish the GRE tunnel to begin the exchange of routing updates. What is the reason for this?
A. Either a firewall between the two routers or an ACL on the router is blocking IP protocol number 47.
B. Either a firewall between the two routers or an ACL on the router is blocking UDP 57.
C. Either a firewall between the two routers or an ACL on the router is blocking TCP 47.
D. Either a firewall between the two routers or an ACL on the router is blocking IP protocol number 57.
You have been asked to evaluate an OSPF network setup in a test lab and to answer questions a customer has about its operation. The customer has disabled your access to the show running-config command.
Which of the following statements is true about the serial links that terminate in R3
A. The R1-R3 link needs the neighbor command for the adjacency to stay up
B. The R2-R3 link OSPF timer values are 30, 120, 120
C. The R1-R3 link OSPF timer values should be 10,40,40
D. R3 is responsible for flooding LSUs to all the routers on the network.