Which two networking devices forward data based on destination MAC address? (Choose two.)
A.
Repeater
B.
Bridge
C.
Switch
D.
Router
E.
Hub
Explanation:
http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/white_paper_c11-465436.html
Layer 2: Data Link Layer
The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer networking.
The data link layer provides the functional and procedural means to transfer data between network entities and might provide the means to detect and possibly correct errors that may occur in the physical layer.
The data link layer is concerned with local delivery of frames between devices on the same LAN. Data-link frames, as these protocol data units are called, do not cross the boundaries of a local network. Inter-network routing and global addressing are higher-layer functions, allowing data-link protocols to focus on local delivery, addressing, and media arbitration. This way, the data link layer is analogous to a neighborhood traffic cop; it endeavors to arbitrate between parties contending for access to a medium, without concern for their ultimate destination.
Layer 2 devices base their forwarding decisions on the destination MAC address of data packets
The following shows the different layers that types of hardware work at.
– Network layer: packets (routers)
– Link layer: frames (bridges and switches)
– Physical layer: electrical signals (repeaters and hubs)
Each network interface is associated with a unique address called its media access control (MAC) address. The MAC address helps route information within your local area network and is used by
interconnecting devices such as switches and bridges
.
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5020-switch/white_paper_c11-465436.html
http://www.cs.princeton.edu/courses/archive/spr09/cos461/docs/lec09-switches.pdf
http://www.cisco1900router.com/tutorial-of-differences-between-hub-bridge-switch-and-router.html
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New 640-911 Exam Questions and Answers Updated Recently (10/Mar/2016):
NEW QUESTION 186
An engineer wants to repurpose a Cisco Nexus 7010 Switch for use in a lab and needs to restore the switch to factory defaults. Which two commands are required? (Choose two.)
A. write erase boot
B. write erase debug
C. copy running-config startup-config
D. reboot
E. reload
F. copy startup-config running-config
Answer: AE
NEW QUESTION 187
Refer to the exhibit. In which two ways does the routing table direct traffic? (Choose two.)
Image URL: w w w.200-120.info/wp-content/uploads/2016/03/1871.png (delete space)
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: AB
NEW QUESTION 188
Which option is the proper shortened representation of the IPv6 address FDFA:0000:0000:2314:00BA:AF34:0:0121?
A. FDFA::2314:BA:AF34:0:121
B. FDFA::2314::BA:AF34:0:0121
C. FDFA::2314:BA:AF34:121
D. FDFA::2314:BA:AF34::121
Answer: A
NEW QUESTION 189
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 190
A network engineer configures several VLANs using NX-OS and wants to save the changes. Which commands are used to save this configuration?
A. write memory
B. copy run start
C. write terminal
D. copy start run
Answer: B
NEW QUESTION 191
……
NEW QUESTION 192
A network engineer has been tasked with connecting a Nexus 5548 switch to an older Catalyst 3750. After configuring the interfaces, the engineer noticed that the end hosts did not have network connectivity and the Nexus 5548 had the following log message:
%STP-2-BRIDGE_ASSURANCE_BLOCK: Bridge Assurance blocking port Ethernet1/27 VLAN0010
What command can solve this problem?
A. configure no spanning-tree port type network on the Nexus 5548 interface
B. configure spanning-tree mode rapid-pvstp on the Catalyst 3750
C. configure switchport trunk native VLAN 10 on the Catalyst 3750 interface
D. configure spanning-tree mode rapid-pvstp on the Nexus 5548
Answer: A
NEW QUESTION 193
What two actions can be taken to enable inter-VLAN communications in the data center? (Choose two.)
A. install a Layer 3 capable switch in the data center
B. deploy a router as a Layer 3 services gateway attached inside each Layer 2 VLAN
C. extend Layer 2 services to a Layer 3 capable VLAN using Layer 3 tunneling
D. connect Layer 2 VLANs together with 802.1Q trunks
E. use a routing protocol to direct packets into the Layer 2 network
Answer: AB
NEW QUESTION 194
……
NEW QUESTION 195
Which two statements describe two benefits of a star topology compared to a mesh topology? (Choose two.)
A. New stations can be added quickly and easily.
B. Troubleshooting connectivity is easier.
C. There is not a single point of failure.
D. A single cable failure will not bring down the entire network.
E. It has the absolute least likelihood of having a collision.
Answer: AB
NEW QUESTION 196
Unlike IPv6, which feature is available only in IPv4?
A. broadcast
B. anycast
C. multicast
D. unicast
Answer: A
NEW QUESTION 197
What TCP/IP layer would handle UDP traffic flows?
A. internetwork
B. network interface
C. transport
D. physical
Answer: C
NEW QUESTION 198
In which layer of the OSI model are TCP port numbers defined?
A. 2
B. 3
C. 4
D. 6
E. 7
Answer: C
NEW QUESTION 199
……
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