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Exam Implementing Cisco IP Routing (ROUTE v2.0)
Number 300-101
File Name Implementing Cisco IP Routing (ROUTE v2-0).test-king.300-101.2019-12-05.1e.506q.vcex
Size 14.71 Mb
Posted December 05, 2019
Downloads 55
Download Implementing Cisco IP Routing (ROUTE v2-0).test-king.300-101.2019-12-05.1e.506q.vcex

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Demo Questions

Question 1

Refer to the exhibit. 

  

A network administrator checks this adjacency table on a router. What is a possible cause for the incomplete marking?

  • A: incomplete ARP information
  • B: incorrect ACL
  • C: dynamic routing protocol failure
  • D: serial link congestion

Correct Answer: A

To display information about the Cisco Express Forwarding adjacency table or the hardware Layer 3-switching adjacency table, use the show adjacency command. 
Reasons for Incomplete Adjacencies 
There are two known reasons for an incomplete adjacency:
The router cannot use ARP successfully for the next-hop interface. 
After a clear ip arp or a clear adjacency command, the router marks the adjacency as incomplete. Then it fails to clear the entry. 
In an MPLS environment, IP CEF should be enameled for Label Switching. Interface level command ip route-cache cef 
No ARP Entry 
When CEF cannot locate a valid adjacency for a destination prefix, it punts the packets to the CPU for ARP resolution and, in turn, for completion of the adjacency. 
Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/17812-cef-incomp.html#t4




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. 
Benefits:
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. 
Reference: http://www.cisco.com/web/strategy/docs/gov/IPV6at_a_glance_c45-625859.pdf




Question 3

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.

Correct Answer: C

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




Question 4

A network administrator executes the command clear ip route. Which two tables does this command clear and rebuild? (Choose two.)

  • A: IP routing
  • B: FIB
  • C: ARP cache
  • D: MAC address table
  • E: Cisco Express Forwarding table
  • F: topology table

Correct Answer: AB

To clear one or more entries in the IP routing table, use the following commands in any mode:

  

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/unicast/5_0_3_N1_1/Cisco_n5k_layer3_ucast_cfg_rel_503_N1_1/l3_manage-routes.html




Question 5

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

Correct Answer: A

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.




Question 6

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 7

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
Reference: http://www.cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a00802d5efe.html




Question 8

Which difference in the packet fragmentation feature between IPv4 and IPv6 devices is true?

  • A: Only IPv6 headers support the DF bit.
  • B: Only IPv6 packets can be fragmented at the destination.
  • C: Only IPv4 headers support the more fragments bit.
  • D: Unlike IPv4 routers, IPv6 routers cannot fragment packets by default.

Correct Answer: D




Question 9

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 10

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:

  










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