Test your basic knowledge |

Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What are the common cabling specifications for Fast Ethernet?
Static access or trunk
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

2. Disables a switch port
UTP Fast Ethernet and Gigabit Ethernet
A switch port that has been shut down automatically due to a serious error condition
Switch(config-if)#shutdown
Wide-Wavelength Division Multiplexing

3. Selects a switch port interface and enters interface configuration mode
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch(config)#interface {type}{module}/{number}
UTP Fast Ethernet and Gigabit Ethernet

4. What is CSMA/CD?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Carrier Sense Multiple Access Collision Detection
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed

5. What CEF adjacency is used to discard packets because of access list or other policy action?
Switch#show errdisable detect
They are dropped (ARP throttling)
70 km for 9 micron SMF; 100 km for 8 micron SMF
The Discard adjacency

6. Displays interface configuration information
Switch#show running-config interface {interface}
FIB with adjacency table
Logical Operation Unit
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

7. Enables error-disable for conditions that trigger port security configured on a port
400 metres half duplex and 2000 metres full duplex
Switch(config)#errdisable detect cause psecure-violation
IEEE 802.3
On

8. Enables automatic re-enabling of error-disabled ports
Switch(config)#errdisable detect cause storm-control
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config)#errdisable recovery cause {all | {cause-name}}
The CEF entry version number

9. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
SVI or native routed interface
400 metres half duplex and 2000 metres full duplex
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config)#errdisable detect cause bpduguard

10. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Value - Mask - and Result (VMR)
300 seconds
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Slow response times - low throughput - runts and other input errors on the switch ports

11. What is 10GBASE-LX4/LW4?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

12. What is the TCAM Value and Mask for an IP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch(config)#errdisable detect cause psecure-violation
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Trunk

13. What is the maximum cabling distance for 1000BASE-CX?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
10 km
25 metres
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

14. What is the TCAM Value and Mask for an Ethernet access list?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

15. What CEF adjacency is used to switch packets that can't be forwarded normally?
S = Short; L = Long; E = Extra-long
Off
The Drop adjacency
The Punt adjacency

16. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
Switch(config)#interface range macro {name}
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
ANSI X3T11 FibreChannel
Numeric values that represent what action to take after the TCAM lookup occurs

17. What is 100BASE-TX?
Slow response times - low throughput - runts and other input errors on the switch ports
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
A name assigned to a ranges of interfaces
In parallel revealing the best (longest) match in a single table lookup

18. What is the standard for 10 Gigabit Ethernet (10GbE)?
IEEE 802.3ae
IEEE 802.3u
Process the first packet in a traffic flow to determine the destination
1000BASE-T full duplex followed by 1000BASE-T half duplex

19. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Switch(config)#errdisable detect cause l2ptguard
Forwarding Information Base
Switch(config)#errdisable detect cause dtp-flap
A name assigned to a ranges of interfaces

20. What are runts?
Packets that have been truncated before they were fully received
R = LAN PHY; W = WAN PHY
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
A switch port that has been shut down automatically due to a serious error condition

21. What is the default timer for automatic re-enabling of error-disabled ports?
Switch#show adjacency [{interface}] [summary | detail]
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch(config-if)#speed {10 | 100 | 1000 | auto}
300 seconds

22. What is the name of the CEF engine that maintains routing information in software?
Feature Manager (FM) and Switching Database Manager (SDM)
LOU registers
By Mask/Value - where each unique mask has eight value patterns associated with it
The Layer 3 engine

23. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
Switch(config)#errdisable detect cause arp-inspection
400 metres half duplex and 2000 metres full duplex
The CEF epoch number
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

24. What is a ternary combination?

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25. Configures the maximum ageing time for entries in the MAC address table
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch(config)#mac address-table aging-time {seconds}
ANSI X3T11 FibreChannel
The CEF entry version number

26. What is WAN PHY used for?
Dynamic
Switch(config-if)#no switchport
A station must wait its turn to transmit; it can't transmit and receive at the same time
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

27. What is 10GBASE-CX4?
SC or MT-RJ
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Creating the VLAN
Switch#show interfaces status

28. What packets are immediately sent to the CEF Layer 3 engine for further processing?

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29. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
Switch(config)#errdisable detect cause rootguard
A station must wait its turn to transmit; it can't transmit and receive at the same time
10GbE operates only at full duplex
The Null adjacency

30. Enables error-disable for errors with dynamic ARP inspection
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
The Null adjacency
Switch(config)#errdisable detect cause arp-inspection
A switch port that has been shut down automatically due to a serious error condition

31. What is the default duplex mode of a 10 Mbps Ethernet interface?
Half duplex
LOU registers
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Down - static access - trunk or tunnel

32. How are ports that are in error-disable state re-enabled by default?
Manually by administratively disabling and re-enabling the port
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch(config)#interface vlan {vlan-id}
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

33. Displays administrative and operational status for a specified interface
A three-fold combination of 0 - 1 and X (don't care)
Switch#show interfaces {interface}
Switch#show cef not-cef-switched
The CEF entry version number

34. What denotes the number of times a CEF entry has been updated since the CEF table was created?
The CEF entry version number
Switch(config)#errdisable detect cause l2ptguard
40 km
Distributed CEF (dCEF)

35. Resets the configuration of a switch port to its default values
Switch(config)#default interface {interface}
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
10 km
Ternary Content-Addressable Memory

36. What is the standard for Fast Ethernet (100 Mbps)?
IEEE 802.3u
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Configure the appropriate values manually on both ends of the link
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

37. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
XENPAK - X2 - or SFP+
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Cabling specifications for 10 Gigabit Ethernet

38. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
Switch(config)#errdisable detect cause rootguard
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
A three-fold combination of 0 - 1 and X (don't care)

39. What are the default error-disable detection causes?
Cabling specifications for 10 Gigabit Ethernet
Switch(config-if)#switchport access vlan {vlan}
The table of learned MAC addresses - ports - and VLAN information
Enable error-disable for all possible causes

40. What is CAM?
Switch(config)#errdisable detect cause link-flap
Content-Addressable Memory
Switch#show interfaces {interface} switchport
10 km

41. What is EMI?
Collision domain
Switch(config)#errdisable detect cause pagp-flap
Electromagnetic Interference
Value - Mask - and Result (VMR)

42. Disables CEF operation on an interface
S = Short; L = Long; E = Extra-long
Switch(config-if)#no ip route-cache cef
IEEE 802.3z
A name assigned to a ranges of interfaces

43. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Static access or trunk
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Creating the VLAN
Configure the appropriate values manually on both ends of the link

44. What is the default age-out time for stale entries in the CAM table?
Static access - trunk - tunnel or dynamic
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Trunk or dynamic
300 seconds

45. What tables are maintained by the CEF Layer 3 engine?
Routing table and ARP table
Switch#show ip cef {interface} [detail]
Switch(config)#interface range macro {name}
Cisco Express Forwarding

46. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
The adjacency table
Switch#show interfaces status
Switch(config)#default interface {interface}
Switch#show interfaces status err-disabled

47. What is the operational mode of a switch port that uses DTP negotiation?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Static access or trunk
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
ANSI X3T11 FibreChannel

48. Specifies the timer for automatic re-enabling of error-disabled ports
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#errdisable recovery interval {seconds}
Switch#show interfaces status err-disabled

49. Displays switch port information for a specified interface
Switch#show interfaces {interface} switchport
Cabling specifications for 10 Gigabit Ethernet
Switch#show ip cef {interface} [detail]
Switch(config)#errdisable detect cause loopback

50. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
10 km
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
On
Switch(config)#errdisable detect cause bpduguard