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Exam Implementing Cisco IP Routing (ROUTE v2.0)
Number 300-101
File Name Implementing Cisco IP Routing (ROUTE v2-0).real-exams.300-101.2019-03-23.1e.469q.vcex
Size 17.45 Mb
Posted March 23, 2019
Downloads 725
Download Implementing Cisco IP Routing (ROUTE v2-0).real-exams.300-101.2019-03-23.1e.469q.vcex

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Question 1

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

Correct Answer: ACE

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/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, as WRED (for the most part) only affects TCP-based flows.  
Granted, it is not always possible to separate TCP-based flows from UDP-based flows, but it is beneficial to be aware of this behavior when making such application-mixing decisions. 

Question 2

Which method allows IPv4 and IPv6 to work together without requiring both to be used for a single connection during the migration process?

  • A: dual-stack method
  • B: 6to4 tunneling
  • C: GRE tunneling
  • D: NAT-PT

Correct Answer: A

Dual stack means that devices are able to run IPv4 and IPv6 in parallel. It allows hosts to simultaneously reach IPv4 and IPv6 content, so it offers a very flexible coexistence strategy. For sessions that support IPv6, IPv6 is used on a dual stack endpoint. If both endpoints support Ipv4 only, then IPv4 is used. 
Native dual stack does not require any tunneling mechanisms on internal networks 
Both IPv4 and IPv6 run independent of each other 
Dual stack supports gradual migration of endpoints, networks, and applications. 

Question 3

Which two actions must you perform to enable and use window scaling on a router? (Choose two.)

  • A: Execute the command ip tcp window-size 65536.
  • B: Set window scaling to be used on the remote host.
  • C: Execute the command ip tcp queuemax.
  • D: Set TCP options to "enabled" on the remote host.
  • E: Execute the command ip tcp adjust-mss.

Correct Answer: AB

The TCP Window Scaling feature adds support for the Window Scaling option in RFC 1323, TCP Extensions for High Performance. A larger window size is recommended to improve TCP performance in network paths with large bandwidth-delay product characteristics that are called Long Fat Networks (LFNs). The TCP Window Scaling enhancement provides that support.  
The window scaling extension in Cisco IOS software expands the definition of the TCP window to 32 bits and then uses a scale factor to carry this 32-bit value in the 16-bit window field of the TCP header. The window size can increase to a scale factor of 14. Typical applications use a scale factor of 3 when deployed in LFNs. 
The TCP Window Scaling feature complies with RFC 1323. The larger scalable window size will allow TCP to perform better over LFNs. Use the ip tcp window-size command in global configuration mode to configure the TCP window size. In order for this to work, the remote host must also support this feature and its window size must be increased.

Question 4

A network administrator uses IP SLA to measure UDP performance and notices that packets on one router have a higher one-way delay compared to the opposite direction. 
Which UDP characteristic does this scenario describe?

  • A: latency
  • B: starvation
  • C: connectionless communication
  • D: nonsequencing unordered packets
  • E: jitter

Correct Answer: A

Cisco IOS IP SLAs provides a proactive notification feature with an SNMP trap. Each measurement operation can monitor against a pre-set performance threshold. Cisco IOS IP SLAs generates an SNMP trap to alert management applications if this threshold is crossed. Several SNMP traps are available: round trip time, average jitter, one-way latency, jitter, packet loss, MOS, and connectivity tests.
Here is a partial sample output from the IP SLA statistics that can be seen:
router#show ip sla statistics 1 
Round Trip Time (RTT) for Index 55 
Latest RTT: 1 ms
Latest operation start time: *23:43:31.845 UTC Thu Feb 3 2005
Latest operation return code: OK
RTT Values:
Number Of RTT: 10 RTT Min/Avg/Max: 1/1/1 milliseconds
Latency one-way time:
Number of Latency one-way Samples: 0
Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds
Destination to Source Latency one way Min/Avg/Max: 0/0/0 milliseconds

Question 5

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.

Correct Answer: B

Enabling PPPoE in a VPDN Group  
Perform this task to enable PPPoE in a virtual private dial-up network (VPDN) group. 
This task applies only to releases prior to Cisco IOS Release 12.2(13)T. 
configure terminal 
vpdn enable 
vpdn-group name 
protocol pppoe 



Question 6

A network engineer has been asked to ensure that the PPPoE connection is established and authenticated using an encrypted password. 
Which technology, in combination with PPPoE, can be used for authentication in this manner?

  • A: PAP
  • B: dot1x
  • C: Ipsec
  • D: CHAP
  • E: ESP

Correct Answer: D

With PPPoE, the two authentication options are PAP and CHAP. When CHAP is enabled on an interface and a remote device attempts to connect to it, the access server sends a CHAP packet to the remote device. The CHAP packet requests or “challenges” the remote device to respond. The challenge packet consists of an ID, a random number, and the host name of the local router.  
When the remote device receives the challenge packet, it concatenates the ID, the remote device’s password, and the random number, and then encrypts all of it using the remote device’s password. The remote device sends the results back to the access server, along with the name associated with the password used in the encryption process. 
When the access server receives the response, it uses the name it received to retrieve a password stored in its user database. The retrieved password should be the same password the remote device used in its encryption process. The access server then encrypts the concatenated information with the newly retrieved password — if the result matches the result sent in the response packet, authentication succeeds. 
The benefit of using CHAP authentication is that the remote device’s password is never transmitted in clear text (encrypted). This prevents other devices from stealing it and gaining illegal access to the ISP’s network. 

Question 7

A corporate policy requires PPPoE to be enabled and to maintain a connection with the ISP, even if no interesting traffic exists. Which feature can be used to accomplish this task?

  • A: TCP Adjust
  • B: Dialer Persistent
  • C: PPPoE Groups
  • D: half-bridging
  • E: Peer Neighbor Route

Correct Answer: B

A new interface configuration command, dialer persistent, allows a dial-on-demand routing (DDR) dialer profile connection to be brought up without being triggered by interesting traffic. When configured, the dialer persistent command starts a timer when the dialer interface starts up and starts the connection when the timer expires. If interesting traffic arrives before the timer expires, the connection is still brought up and set as persistent. The command provides a default timer interval, or you can set a custom timer interval. 
To configure a dialer interface as persistent, use the following commands beginning in global configuration mode:


Question 8

Which PPP authentication method sends authentication information in clear text?

  • A: MS CHAP
  • B: CDPCP
  • C: CHAP
  • D: PAP

Correct Answer: D

PAP authentication involves a two-way handshake where the username and password are sent across the link in clear text; hence, PAP authentication does not provide any protection against playback and line sniffing. 
CHAP authentication, on the other hand, periodically verifies the identity of the remote node using a three-way handshake. After the PPP link is established, the host sends a "challenge" message to the remote node. The remote node responds with a value calc“lated usi”g a one-way hash function. The host checks the response against its own calculation of the expected hash value. If the values match, the authentication is acknowledged; otherwise, the connection is terminated. 

Question 9

Which protocol uses dynamic address mapping to request the next-hop protocol address for a specific connection?

  • A: Frame Relay inverse ARP
  • B: static DLCI mapping
  • C: Frame Relay broadcast queue
  • D: dynamic DLCI mapping

Correct Answer: A

Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a specific connection, given its known DLCI. Responses to Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server; the table is then used to supply the next-hop protocol address or the DLCI for outgoing traffic.

Question 10

Which statement is true about the PPP Session Phase of PPPoE?

  • A: PPP options are negotiated and authentication is not performed. Once the link setup is completed, PPPoE functions as a Layer 3 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers.
  • B: PPP options are not negotiated and authentication is performed. Once the link setup is completed, PPPoE functions as a Layer 4 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers.
  • C: PPP options are automatically enabled and authorization is performed. Once the link setup is completed, PPPoE functions as a Layer 2 encapsulation method that allows data to be encrypted over the PPP link within PPPoE headers.
  • D: PPP options are negotiated and authentication is performed. Once the link setup is completed, PPPoE functions as a Layer 2 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers.

Correct Answer: D

PPPoE is composed of two main phases:
Active Discovery Phase — In this phase, the PPPoE client locates a PPPoE server, called an access concentrator. During this phase, a Session ID is assigned and the PPPoE layer is established. 
PPP Session Phase — In this phase, PPP options are negotiated and authentication is performed. Once the link setup is completed, PPPoE functions as a Layer 2 encapsulation method, allowing data to be transferred over the PPP link within PPPoE headers. 





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