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New Cisco 300-101 Exam Dumps Collection (Question 12 - Question 21)

Question No: 12

Which two statements about EVN are true? (Choose two)

A. Virtual network tags are assigned per-VRF.

B. it is supported only on access ports.

C. Virtual network tags are assigned globally.

D. Routing metrics can be manipulated only from directly within the routing-context configuration.

E. The VLAN ID in the 802.1q frame carries the virtual network tag.

F. The VLAN ID is the ISL frame carries the virtual network tag.

Answer: A,E

Question No: 13

Which mode of uRPF causes a router interface to accept a packet, if the network to which the packetu2021s source IP address belongs is found in the routeru2021s FIB?

A. Strict mode

B. Loose mode

C. Auto mode

D. Desirable mode

Answer: B

Explanation:

EXPLANATION/REFRENCE

A number of common types of DoS attacks take advantage of forged or rapidly changing source IP addresses, allowing attackers to thwart efforts by ISPs to locate or filter these attacks. Unicast RPF was originally created to help mitigate such attacks by providing an automated, scalable mechanism to implement the Internet Engineering Task Force (IETF) Best Common Practices 38/Request for Comments 2827 (BCP 38/RFC 2827) anti-spoofing filtering on the customer-to-ISP network edge. By taking advantage of the information stored in the Forwarding Information Base (FIB) that is created by the CEF switching process, Unicast RPF can determine whether IP packets are spoofed or malformed by matching the IP source address

and ingress interface against the FIB entry that reaches back to this source (a so-called reverse lookup). Packets that are received from one of the best reverse path routes back out of the same interface are forwarded as normal. If there is no reverse path route on the sam e interface from which the packet was received, it might mean that the source address was modified, and the packet is dropped (by default).

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_data_urpf/configuration/xe-3s/sec-data-urpf-xe-3s-book/sec-unicast-rpf-loose-mode.html?referring_site=RE&pos=1&page=http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/srpf_gsr.html#GUID-FFFA94D5- EEFB-4215-9EE1-DB37CD01C2CA

Question No: 14

A network engineer wants an NTP clients to be able to update the local system without updating or synchronizing with the remote system. Which option for the ntp access-group command is needed to accomplish this?

A. serve

B. query-only

C. serve-only

D. peer

Answer: A

Question No: 15

In a comparison of an IPv4 header with an IPv6 header, which three statements are true?

(Choose three.)

A. An IPv4 header includes a checksum. However, an IPv6 header does not include one.

B. A router has to recompute the checksum of an IPv6 packet when decrementing the TTL.

C. An IPv6 header is half the size of an IPv4 header.

D. An IPv6 header has twice as many octets as an IPv4 header.

E. An IPv6 header is simpler and more efficient than an IPv4 header.

F. The 128-bit IPv6 address makes the IPv6 header more complicated than an IPv4 header.

Answer: A,D,E

Explanation:

The image below shows the differences between an IPv4 header and an IPv6 header:

(Reference and a good resource, too: http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_9-3/ipv6_internals.html)

Question No: 16

Which three functionalities are specific to stateful NAT64? (Choose Three)

A. It requires IPv4-transalable IPv6 address

B. It requires either manual or DHCPv6 based address assignment for IPv6 host.

C. It helps ensure end-to-end address transparency and scalability.

D. A state or bindings are created on every unique translation.

E. It conserves IPv4 addresses.

Answer: B,D,E

Question No: 17

Refer to exhibit.

What is indicated by the show ip cef command for an address?

A. CEF is unable to get routing information for this route.

B. CEF cannot switch packet for this route and passes it to the next best switching method.

C. A valid entry and is pointed to hardware based forwarding.

D. CEF cannot switch packet for this route and drops it.

Answer: B

Explanation: Glean adjacency u2013 in short when the router is directly connected to hosts the FIB table on the router will maintain a prefix for the subnet rather than for the individual host prefix. This subnet prefix points to a GLEAN adjacency.

Punt adjacency u2013 When packets to a destination prefix canu2021t be CEF Switched, or the feature is not supported in the CEF Switching path, the router will then use the next slower switching mechanism configured on the router.

Question No: 18

Refer to the exhibit.

Which technology can be employed to automatically detect a WAN primary link failure and failover to the secondary link?

A. HSRP

B. VRRP

C. IP SLA

D. multicast

Answer: C

Question No: 19

In SNMP v3, which security level provides encryption of the data?

A. authMember

B. noAuthNoPriv

C. authNoPriv

D. authPriv

Answer: D

Question No: 20

A network engineer wants to baseline the network to determine suitability for real-time voice applications. Which IP SLA operation is best suited for this task?

A. ICMP-echo

B. ICMP-jitter

C. UDP-connect

D. UDP-jitter

E. TCP-connect

F. UDP-echo

Answer: F

Question No: 21

Company plans on migrating their network from IPv4 to IPv6 in the near future. Which three techniques can be used to transition from IPv4 to IPv6? (Select three)

A. Dual stack

B. NAT

C. Flow label

D. Mobile IP

E. 6to4 tunneling

F. Anycast

G. MBGP

Answer: A,B,E

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