Introducing Cisco Data Center Networking, Exams of Computer Networks

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640-911_formatted

Number: 640- Passing Score: 800 Time Limit: 120 min File Version: 1.

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Cisco 640-

Introducing Cisco Data Center Networking

Version: 8. Cisco 640-911 Exam

Exam A

QUESTION 1 What are two attributes of a VLAN? (Choose two.)

A. A VLAN defines a collision domain.

B. A VLAN defines a broadcast domain.

C. Broadcasts are flooded to all VLANs.

D. Collisions are flooded to all VLANs.

E. A Layer 3 device is required to route packets between VLANs.

F. A Layer 2 device is required to route packets between VLANs.

Correct Answer: BE Section: (none) Explanation

Explanation/Reference: Explanation: "In computer networking, a single layer-2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them via one or more routers; such a domain is referred to as a virtual local area network, virtual LAN or VLAN." "A router (Layer 3 device) serves as the backbone for network traffic going across different VLANs." http://en.wikipedia.org/wiki/Virtual_LAN

QUESTION 2 Which four statements indicate unique properties of VLAN 1 on Cisco Nexus switches? (Choose four.)

A. VLAN 1 is used to flood multicast traffic.

B. VLAN 1 cannot be deleted.

C. VLAN 1 is used for Cisco Discovery Protocol.

D. VLAN 1 is used for VTP advertisements.

E. VLAN 1 defines a collision domain.

F. VLAN 1 defines a broadcast domain.

Correct Answer: BCDF Section: (none) Explanation

Explanation/Reference: Explanation: http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx- os/layer2/configuration/guide/ Cisco_Nexus_7000_Series_NX- S_Layer_2_Switching_Configuration_Guide_Release_5.x_chapter4.html

QUESTION 3 Which command displays the Trunking Native Mode VLAN on port Ethernet 1/18?

A. show running-config switchport e1/

B. show running-config e1/18 switchport

C. show interface e1/

D. show interface e1/18 switchport

E. show interface e1/18 native

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation: NX# show interface e1/18 switchport

A. Establish a range of IP addresses that are dedicated to the growing use of multicast video.

B. Establish a range of IP addresses that are dedicated to the growing use of peer-to-peer file- sharing applications.

C. Establish a range of IP addresses that are dedicated to use on internal networks.

D. Establish a range of IP addresses to address the shrinking pool of globally routable addresses.

E. Delay the transition to IPv6.

Correct Answer: CD Section: (none) Explanation

Explanation/Reference: Explanation: http://tools.ietf.org/html/rfc

QUESTION 7 What are three reasons to migrate from IPv4 to IPv6? (Choose three.)

A. IPv6 eliminates the requirement for NAT.

B. IPv6 includes enough IP addresses to allocate more than four billion IP addresses to every person on earth.

C. IPv6 eliminates the need for VLANs.

D. Hosts can be assigned an IP address without DHCP.

E. Hosts can be assigned an IP address without DNS.

Correct Answer: ABD Section: (none) Explanation

Explanation/Reference: Explanation: "IPv6 address contains 32 characters vs. 12 in IPv4. This will grant no ip address translation and dynamic changes. We will even don't need NAT! " http://www.ipv6.ru/english/history/goipv6.php " IPv6 uses a 128-bit address, allowing 2128, or approximately 3.4×1038 addresses, or more than 7.9×1028 times as many as IPv4, which uses 32-bit addresses" http://en.wikipedia.org/wiki/IPv

QUESTION 8 Which two options describe services that are provided by TCP? (Choose two.)

A. session multiplexing

B. EtherTypes identify destination services

C. connection-oriented

D. best-effort packet delivery

E. binary translation

Correct Answer: AC Section: (none) Explanation

Explanation/Reference: Explanation: "TCP is a connection-oriented protocol." http://www.diffen.com/difference/TCP_vs_UDP

QUESTION 9 Which two options describe services that are provided by UDP? (Choose two.)

A. session multiplexing

B. segmentation

C. connection-oriented

D. reliable packet delivery

E. best-effort packet delivery

Correct Answer: AE Section: (none) Explanation

Explanation/Reference: Explanation: "UDP is faster because there is no error-checking for packets." http://www.diffen.com/difference/ TCP_vs_UDP

QUESTION 10 Which two options represent a subnet mask that allows for a maximum of 14 available host addresses on a subnet? (Choose two.)

A. 255.255.255.

B. 255.255.255.

C. 255.255.240.

D. 255.255.192.

E. /

F. /

G. /

H. /

Correct Answer: AH Section: (none) Explanation

Explanation/Reference: Explanation: Example: Address: 192.168.1. Bitmask: 28 Netmask: 255.255.255. Network: 192.168.1. HostMin: 192.168.1. HostMax: 192.168.1. Broadcast: 192.168.1. Hosts: 16

QUESTION 11 What is the binary value of the hexadecimal number 0x511?

A. 10100011001

B. 10101010101

C. 10110010001

D. 10100010001

E. 10100110011

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation: Decimal 1297

on a computer network."

QUESTION 15

Which option is an example of a link-state routing protocol?

A. EIGRP

B. RIP

C. OSPF

D. ARP

Correct Answer: C Section: (none) Explanation

Explanation/Reference: Explanation: http://en.wikipedia.org/wiki/Link-state_routing_protocol "A link-state routing protocol is one of the two main classes of routing protocols used in packet switching networks for computer communications (the other is the distance-vector routing protocol). Examples of link state routing protocols include open shortest path first (OSPF) and intermediate system to intermediate system (IS-IS)."

QUESTION 16

What is the maximum allowable hop count for RIPv1?

A. 4

B. 8

C. 12

D. 15

E. 16

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation: "Without using RMTI, the hop count cannot exceed 15, otherwise it will be considered invalid." http:// en.wikipedia.org/wiki/Routing_Information_Protocol

QUESTION 17

What is the default periodic interval at which RIPv1 sends routing updates?

A. 15 seconds

B. 30 seconds

C. 45 seconds

D. 60 seconds

E. 90 seconds

F. RIPv1 only sends routing updates when the topology changes.

Correct Answer: B Section: (none) Explanation

Explanation/Reference: Explanation: "Originally, each RIP router transmitted full updates every 30 seconds." http://en.wikipedia.org/wiki/ Routing_Information_Protocol

QUESTION 18

What does RIPv1 send to its neighbors?

A. Information about changed routes

B. Information about new routes

C. The entire routing table

D. Information about deleted routes

Correct Answer: C Section: (none) Explanation

Explanation/Reference: Explanation: "On receiving the Routing table, the router processes each entry of the routing table as per the following rules" http://en.wikipedia.org/wiki/Routing_Information_Protocol

QUESTION 19 What are two advantages of employing an external router for inter-VLAN routing over an IEEE 802.1Q trunk link? (Choose two.)

A. Layer 3 functionality is not required on the switch.

B. The router facilitates communication between VLANs.

C. The single traffic path is optimized.

D. Latency is reduced as packets leave the switch.

E. Equal-Cost Multipath is supported.

Correct Answer: AB Section: (none) Explanation

Explanation/Reference: Explanation:

QUESTION 20 Which statement correctly describes an SVI?

A. An SVI is a Layer 2 interface and uses a dynamic MAC address.

B. An SVI cannot have an IP address assigned to it.

C. An SVI provides Layer 3 routing between VLANs.

D. Each switch port requires an SVI assignment.

Correct Answer: C Section: (none) Explanation

Explanation/Reference: Explanation: http://en.wikipedia.org/wiki/Switch_virtual_interface

QUESTION 21 What is the Cisco Nexus Operating System command to define a port as a Layer 3 port?

A. Port routed

B. No switchport

C. l3 switchport

D. Port switching off

Correct Answer: B Section: (none)

a Layer 2 interface to a routed interface, enter the no switchport command." http://www.cisco.com/en/US/ docs/switches/datacenter/nexus5000/sw/command/reference/layer2/ n5kl2_cmds_n.pdf

QUESTION 25

Which version of Cisco Nexus Operating System became a common operating system for Cisco Nexus switches and Cisco MDS storage switches?

A. 2.

B. 3.

C. 3.

D. 4.

E. 5.01GD

F. 6.

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation: "While many of the changes leading to convergence are product releases and features, others are more symbolic. One of these symbolic changes is the rebranding, of Cisco® MDS 9000 SAN-OS Software as Cisco MDS 9000 NX-OS® Software effective with Release 4.1." http://www.cisco.com/en/US/prod/ collateral/ps4159/ps6409/ps5989/ps9898/Rebranding_MDS_90 00.html

QUESTION 26

What are two core features of Cisco Nexus Operating System? (Choose two.)

A. SNMPv

B. RMON

C. System Manager

D. PSS

E. VRF

F. TRILL

Correct Answer: CD Section: (none) Explanation

Explanation/Reference: Explanation: https://learningnetwork.cisco.com/thread/

QUESTION 27

What is the acronym expansion of the UDLD feature of Cisco Nexus Operating System?

A. UniDirectional Link Detection

B. Unified Data Link Distribution

C. Unified Data Loss Detection

D. Unified Directional Link Distribution

E. Unidirectional Data Loss Detection

Correct Answer: A Section: (none) Explanation

Explanation/Reference: Explanation: "Unidirectional Link Detection (UDLD) is a data link layer protocol from Cisco Systems to monitor the

physical configuration of the cables and detect unidirectional links." http://en.wikipedia.org/wiki/ Unidirectional_Link_Detection

QUESTION 28

What are four security features that are included in Cisco Nexus Operating System? (Choose four.)

A. Cisco TrustSec

B. IEEE 802.1Qau

C. CoPP

D. port security

E. PIM

F. SSL VPN

G. IPsec VPN

H. ACLs

Correct Answer: ACDH Section: (none) Explanation

Explanation/Reference: Explanation: https://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9402/ps9512/brochure_cisco_nex us_7000_series_security_features.pdf

QUESTION 29 What are three modular Layer 2 processes in Cisco Nexus Operating System? (Choose three.)

A. UDLD

B. PIM

C. HSRP

D. STP

E. Cisco Discovery Protocol

F. OSPF

Correct Answer: ADE Section: (none) Explanation

Explanation/Reference: Explanation: "PIM is IP routing protocol-independent and can leverage whichever unicast routing protocols are used to populate the unicast routing table, including Enhanced Interior Gateway Routing Protocol (EIGRP), Open Shortest Path First (OSPF), Border Gateway Protocol (BGP), and static routes. PIM uses this unicast routing information to perform the multicast forwarding function. Although PIM is called a multicast routing protocol, it actually uses the unicast routing table to perform the RPF check function instead of building up a completely independent multicast routing table. Unlike other routing protocols, PIM does not send and receive routing updates between routers." http://www.cisco.com/en/US/docs/ios/solutions_docs/ ip_multicast/White_papers/mcst_ovr.html#w p "Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy protocol for establishing a faulttolerant default gateway. ·In the configuration procedures, the specified interface must be a Layer 3 interface:" http://www.cisco.com/ en/US/docs/switches/lan/catalyst3750/software/release/12.2_55_se/configur ation/guide/ swhsrp.html OSPF (Open Shortest Path First) - routing protocol.

QUESTION 30

What are three modular Layer 3 processes in Cisco Nexus Operating System? (Choose three.)

A. Alt-A

B. Alt-F

C. Alt-N

D. Alt-E

E. Alt-P

Correct Answer: CE Section: (none) Explanation

Explanation/Reference: Explanation: "Alt-P History search backwards Alt-N History search forwards" http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli_rel_4 _0_1a/ begin.html

QUESTION 33 What is the function of the Tab key on the Cisco Nexus Operating System command-line interface?

A. redisplays the current command line

B. deletes all characters from the cursor to the end of the command line

C. clears the terminal screen

D. completes a partially entered command if enough characters are present

E. moves the cursor one word to the right

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation: "Completes the word for you after entering the first characters of the word, and then pressing the Tab key. All options that match are presented." http://www.cisco.com/en/US/docs/switches/datacenter/sw/4_1/nx- os/fundamentals/configuration/guide/ Cisco_Nexus_7000_Series_NX- OS_Fundamentals_Configuration_Guide__Release_4.1_chapter4.html

QUESTION 34 Where does Cisco Nexus Operating System store the running configuration file?

A. RAM

B. flash

C. bootflash

D. volatile

E. NVRAM

Correct Answer: A Section: (none) Explanation

Explanation/Reference: Explanation: "The "running-config" file is stored in RAM." http://www.omnisecu.com/cisco-certified-network-associate-ccna/cisco-router-configuration- files.php

QUESTION 35 Where does Cisco Nexus Operating System store the startup configuration file?

A. RAM

B. flash

C. bootflash

D. volatile

E. NVRAM

Correct Answer: E Section: (none) Explanation

Explanation/Reference: Explanation: "A persistent copy of Cisco Router configuration file is called as "startup-config" file. The "startup- config" file is kept in NVRAM and the contents of the "startup-config" file are retained after a reboot." http://www.omnisecu.com/cisco-certified-network-associate-ccna/cisco-router-configuration- files.php

QUESTION 36 Which two commands would you use to erase the Cisco Nexus Operation System configuration and return the switch to factory defaults? (Choose two.)

A. nexus# write erase boot

B. nexus# erase configuration

C. nexus# erase running-configuration

D. nexus# erase startup-configuration

E. nexus# reboot

F. nexus# reload

G. nexus# shutdown

Correct Answer: AF Section: (none) Explanation

Explanation/Reference: Explanation:

QUESTION 37 What is the minimum required command to enter global configuration mode on a Cisco Nexus switch?

A. nexus# con

B. nexus# configure

C. nexus# configure global

D. nexus# configure terminal

Correct Answer: A Section: (none) Explanation

Explanation/Reference: Explanation: Example: NX# con Enter configuration commands, one per line. End with CNTL/Z. NX(config)# PS. in IOS minimum "conf t"

QUESTION 38 Which option would you use to exit the Cisco Nexus Operating System interface configuration mode and return to the exec prompt?

A. nexus(config-if)#Ctrl-C nexus#

Explanation:

QUESTION 41

What is the correct format of an access control list on a Cisco Nexus switch to deny hosts on the 172.16.1.0/21 network from accessing HTTP proxy servers listening on port 8080?

A. N5K-A(config)# ip access-list 101 N5K-A(config-acl)# deny tcp 172.16.1.0 0.0.7.255 any eq 8080 N5K-A(config-acl)# permit ip any any

B. N5K-A(config)# ip access-list 101 N5K-A(config-acl)# deny tcp any 172.16.1.0 255.255.248.0 eq 8080 N5K-A(config-acl)# permit ip any any

C. N5K-A(config)#access-list 101 deny tcp172.16.1.0 0.0.15.255 eq 8080

D. N5K-A(config)# ip access-list 101 N5K-A(config-acl)# deny tcp any host 172.16.1.0/21 eq 8080

Correct Answer: A Section: (none) Explanation

Explanation/Reference: Explanation:

QUESTION 42

What is the correct format of an access control list on a Cisco Nexus switch to only permit unencrypted Web traffic from the 172.16.1.0/25 network to destination host 10.10.1.110?

A. N5K-A(config)# ip access-list 101 N5K-A(config-acl)# permit tcp host 172.16.1.0/25 any eq 80

B. N5K-A(config)# ip access-list 101 N5K-A(config-acl)# permit tcp 172.16.1.0 255.255.255.128 any eq 80

C. N5K-A(config)# ip access-list 101 N5K-A(config-acl)# permit tcp 172.16.1.0/25 any eq 80

D. N5K-A(config)#access-list 101 permit tcp 172.16.1.0/25 0.0.0.128 eq 80

E. N5K-A(config)# ip access-list 101 N5K-A(config-acl)# permit tcp any 172.16.1.0 255.255.248.0 eq 80

Correct Answer: C Section: (none) Explanation

Explanation/Reference: Explanation:

QUESTION 43 Which device forwards data based on the destination IP address?

A. repeater

B. bridge

C. switch

D. router

E. hub

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation:

QUESTION 44

Which network topology is most closely associated with classical CSMA/CD?

A. bus

B. token passing bus

C. star

D. extended star

E. ring

Correct Answer: A Section: (none) Explanation

Explanation/Reference: Explanation: "For the bus topology, the "classical" access methods are the CSMA/CD.." http://books.google.com/books? id=tmJzufisExQC&pg=PA39&lpg=PA39&dq=classic+CSMA/CD+b us +topology&source=bl&ots=b1L_uaAcVR&sig=Tx8zfIavph8RFr9N5n5EDv2WZZo&hl=ru&sa=X& ei=jnDmUsTTD4no4gSd_oGwCw&ved=0CCwQ6AEwAQ#v=onepage&q=classic%20CSMA%2FC D% 20bus%20topology&f=false

QUESTION 45

Which network topology is most closely associated with FDDI?

A. bus

B. token passing bus

C. star

D. extended star

E. ring

Correct Answer: E Section: (none) Explanation

Explanation/Reference: Explanation: http://en.wikipedia.org/wiki/Fiber_Distributed_Data_Interface

QUESTION 46

Which layer of the OSI model is associated with Token Ring Media Access Control?

A. datagram

B. routing

C. network

D. data link

E. transport

F. transmission

G. session

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation: "Token ring local area network (LAN) technology was a protocol which resided at the data link layer (DLL) of the OSI model." http://en.wikipedia.org/wiki/Token_ring

What is required to allow devices that are using RFC 1918 addresses to communicate over the Internet?

A. A private to public VLAN must be defined on the Internet border device.

B. The Internet firewall must permit RFC 1918 addresses.

C. VLAN translation is required on the Internet border device.

D. Network address translation is required on the Internet border device.

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation: "The majority of NATs map multiple private hosts to one publicly exposed IP address. In a typical configuration, a local network uses one of the designated "private" IP address subnets (RFC 1918)" http://en.wikipedia.org/wiki/Network_address_translation

QUESTION 51 What is the addressing format of IPv6?

A. 48-bit dotted decimal

B. 48-bit colon-delimited hexadecimal

C. 64-bit dotted decimal

D. 64-bit colon-delimited hexadecimal

E. 128-bit dotted decimal

F. 128-bit colon-delimited hexadecimal

Correct Answer: F Section: (none) Explanation

Explanation/Reference: Explanation: "IPv6 addresses are represented as eight groups of four hexadecimal digits separated by colons. The length of an IPv6 address is 128 bits" http://en.wikipedia.org/wiki/IPv

QUESTION 52 Which statement describes the function of the OSI transport layer?

A. It segments data from the system of the sending host and reassembles the data into a data stream on the system of the receiving host.

B. It provides the connectivity and path selection between two host systems that may be located on geographically separated networks.

C. It defines how data is formatted for transmission and how access to the physical media is controlled.

D. It establishes, manages, and terminates sessions between two communicating hosts.

Correct Answer: A Section: (none) Explanation

Explanation/Reference: Explanation: http://en.wikipedia.org/wiki/Transport_layer

QUESTION 53 Which transport protocol requires a three-way handshake to establish a new connection?

A. ARP

B. UDP

C. IP

D. TCP

Correct Answer: D Section: (none) Explanation

Explanation/Reference: Explanation: "To establish a connection, TCP uses a three-way handshake." http://en.wikipedia.org/wiki/ Transmission_Control_Protocol

QUESTION 54

What is the subnet mask for the network 172.16.0.0/21?

A. 255.255.0.

B. 255.255.255.

C. 255.255.248.

D. 255.255.255.

E. 255.255.248.

F. 255.255.255.

Correct Answer: C Section: (none) Explanation

Explanation/Reference: Explanation:

QUESTION 55 What is the dotted hexadecimal representation of the IP address 172.13.99.225?

A. AC.0D.63.E

B. AB.63.99.D

C. E2.1D.E1.

D. BC.0C.C3.1F

E. CC.0D.F3.

Correct Answer: A Section: (none) Explanation

Explanation/Reference: Explanation:

QUESTION 56 What is the decimal value of the hexadecimal number 0x718?

A. 718

B. 1816

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C. 2907