640-911 | Cisco 640-911 Exam Dumps 2021
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NEW QUESTION 1
Which two network topologies are the most popular in switching? (Choose two.)
- A. Bus
- B. Token passing bus
- C. Star
- D. Extended star
- E. Ring
Answer: CD
Explanation: http://en.wikipedia.org/wiki/Network_topology
NEW QUESTION 2
Which statement describes the purpose of the MAC address forwarding table of a switch?
- A. The switch consults the forwarding table to determine the best route to a destination.
- B. The switch consults the forwarding table to determine the output port.
- C. The switch consults the forwarding table to determine if the packet is routable.
- D. The switch consults the forwarding table to determine if access control permits the packet.
Answer: B
NEW QUESTION 3
What action does a switch take if the destination MAC address is unknown?
- A. Discard frame
- B. Send ICMP unreachable message to source
- C. Flood packet on all ports
- D. Compare destination IP address against an ACL to determine if it is permitted
- E. Send gratuitous ARP on all ports and wait for reply before forwarding
Answer: C
Explanation: "What happens though when the switch receives a frame with a destination MAC address that is not included in the table? In that case the switch will just broadcast/flood the frame with the unknown destination address to all of its ports (apart from the port where the frame came from). This process is called unknown unicast flooding. " http://telconotes.wordpress.com/2013/03/09/how-a-switch-works/
NEW QUESTION 4
Which two options describe what can happen when devices are in the same broadcast domain? (Choose two.)
- A. They are on the same VLAN and the same switch.
- B. They are on different VLANs and the same switch.
- C. They are on different VLANs and different switches.
- D. They are on the same VLAN and different switches.
Answer: AD
NEW QUESTION 5
When you configure the Call Home feature on the Cisco Nexus 5000 Series Switch, which three parameters are mandatory? (Choose three.)
- A. contract ID
- B. email-contact
- C. switch priority
- D. phone number
- E. customer ID
- F. site ID
- G. street address
Answer: BDG
NEW QUESTION 6
In Cisco NX-OS, which three options are possible spanning tree port types? (Choose three.)
- A. bridge
- B. network
- C. normal
- D. root
- E. edge
- F. fixed
Answer: BCE
NEW QUESTION 7
What are three modular Layer 3 processes in Cisco Nexus Operating System? (Choose three.)
- A. UDLD
- B. PIM
- C. HSRP
- D. STP
- E. OSPF
- F. Cisco Discovery Protocol
Answer: BCE
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#wp1009068
"Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy protocol for establishing a fault tolerant 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/configuration/guide/swhsrp.html
OSPF (Open Shortest Path First) - routing protocol.
NEW QUESTION 8
What are two features of a bridge? (Choose two.)
- A. Reliable transmission
- B. Operate at OSI Layer 2
- C. Operate at OSI Layer 3
- D. Create multiple broadcast domains
- E. Create multiple collision domains
- F. Flood input packets to all ports
- G. Drop IP packets with invalid destination ports
Answer: BE
Explanation: "- a bridge is a two interfaces device that creates 2 collision domains, since it forwards the traffic it receives from one interface only to the interface where the destination layer 2 device (based on his mac address) is connected to. A bridge is considered as an "intelligent hub" since it reads the destination mac address in order to forward the traffic only to the interface where it is connected"
https://learningnetwork.cisco.com/thread/1734
NEW QUESTION 9
What is the maximum distance that is supported by Cisco passive Twinax cables?
- A. 3 m
- B. 4 m
- C. 5 m
- D. 10 m
Answer: C
NEW QUESTION 10
Which three options represent a subnet mask that allows for 60 host addresses on a subnet? (Choose three.)
- A. /25
- B. 255.255.255.192
- C. /26
- D. 255.255.255.240
- E. 255.255.255.248
- F. /28
- G. /30
Answer: ABC
NEW QUESTION 11
Refer to the exhibit. What two destination addresses will be in the packet and frame header generated at PC-A for traffic going to the Server? (Choose two.)
- A. IP address of the Server
- B. MAC address of router interface eth1
- C. IP address of router interface Eth1
- D. MAC address of the Server
- E. IP address of switch interface E1/9
- F. MAC address of switch interface E1/9
Answer: AB
NEW QUESTION 12
What RFC standard defines address ranges that are not routable across public networks?
- A. RFC 1919
- B. RFC 1918
- C. RFC 2036
- D. RFC 2050
- E. RFC 5150
Answer: B
NEW QUESTION 13
Which two networking devices forward data based on destination MAC address? (Choose two.)
- A. Repeater
- B. Bridge
- C. Switch
- D. Router
- E. Hub
Answer: BC
Explanation: http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/white_paper_c11- 465436.html
NEW QUESTION 14
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.
Answer: D
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
NEW QUESTION 15
Which Cisco data center switch can support a 4-RU physical space requirement and also support FEX, Layer 2 and Layer 3, converged FCoE, and up to ninety-six 40-Gigabit Ethernet ports?
- A. Cisco Nexus 5548 Switch
- B. Cisco Nexus 5010 Switch
- C. Cisco Nexus 1010 Switch
- D. Cisco Nexus 7004 Switch
- E. Cisco Nexus 6004 Switch
Answer: E
NEW QUESTION 16
What are three characteristics of the Ethernet access method CSMA/CD? (Choose three.)
- A. It allows many stations access to the same wire.
- B. It provides segmentation of a LAN.
- C. It allows a transmitting station to detect activity on the wire.
- D. It allows for detection of collisions on the wire.
- E. It provides broadcast capability on the wire.
Answer: ACD
NEW QUESTION 17
Which device would you select to partition a network into VLANs?
- A. repeater
- B. bridge
- C. switch
- D. router
- E. hub
Answer: C
NEW QUESTION 18
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.
Answer: AB
NEW QUESTION 19
0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)"
http://tools.ietf.org/html/rfc1918
5. What is the minimum number of fabric modules that should be installed in the Cisco Nexus 7000 chassis for N 1 redundancy using M1-Series line card?
- A. 3
- B. 4
- C. 5
- D. 6
Answer: B
Explanation: Decimal 1816
Binary 11100011000
Hexadecimal 0x718 Roman MDCCCXVI Dotted decimal 0.0.7.24
8. What does RFC 4193 define?
A. IPv6 private network address space
B. IPv4 private network address space
C. unique local address
D. link-local address
Answer: A
9. Refer to the exhibit.
In which two ways does the routing table direct traffic? (Choose two.)
A. The router receives a default route via a dynamic routing protocol.
B. 10.235.4.37 is the IP address of a local interface.
C. 10.235.4.37 is the IP address of the neighbor router that is locally connected.
D. 10.235.4.36 is the IP address of the directly connected neighbor.
E. The gateway of last resort is statically configured.
Answer: A,B
10. At which layer in the OSI stack does the Hypertext Transfer Protocol operate?
A. Layer 1
B. Layer 2
C. Layer 3
D. Layer 4
E. Layer 5
F. Layer 6
G. Layer 7
Answer: G
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