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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 is the DTP negotiation mode of a switch port configured as static access?
Wide-Wavelength Division Multiplexing
Static access or dynamic
Off
The Drop adjacency

2. What is 10GBASE-LR/LW?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Layer 3 forwarding engine
Switch(config)#no ip cef
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

3. What is the operational mode of a switch port that is a member of one VLAN?
Static access
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
UTP Fast Ethernet and Gigabit Ethernet
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T

4. What are the names of CEF optimisation techniques using specialised forwarding hardware?
UTP Fast Ethernet and Gigabit Ethernet
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
SC or MT-RJ

5. What is LOU?
The switch port falls back to default setting of half duplex
Logical Operation Unit
Switch(config)#errdisable detect cause bpduguard
A station must wait its turn to transmit; it can't transmit and receive at the same time

6. What are the operational modes of a Layer 2 switched interface?
Down - static access - trunk or tunnel
Switch(config)#errdisable detect cause link-flap
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

7. What is the maximum cabling distance for 10GBASE-LX4/LW4?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
300 seconds
Switch(config-if)#no switchport
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

8. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Tunnel
Slow response times - low throughput - runts and other input errors on the switch ports
Switch(config-if)#shutdown

9. What CEF optimisation replicates the entire FIB table among switch line cards?
Feature Manager (FM) and Switching Database Manager (SDM)
Switched virtual interface (SVI)
Distributed CEF (dCEF)
The Null adjacency

10. Enables error-disable detection
Carrier Sense Multiple Access Collision Detection
Switch(config)#errdisable detect cause storm-control
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch(config)#errdisable detect cause {all | {cause-name}}

11. What is the TCAM Value and Mask for an IGMP access list?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Creating the VLAN
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

12. Displays CEF Drop statistics with number of packets and reason for each line card
On
SC fibre optic or RJ-45 UTP
Switch#show cef drop
Switch#show ip cef {interface} [detail]

13. Configures the maximum ageing time for entries in the MAC address table
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Forwarding Information Base
Cabling specifications for Gigabit Ethernet
Switch(config)#mac address-table aging-time {seconds}

14. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Switch(config-if)#no switchport
On
The adjacency table
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

15. What is the standard for Fast Ethernet (100 Mbps)?
The CEF entry version number
IEEE 802.3u
Static access
Full duplex

16. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch#show adjacency [{interface}] [summary | detail]
Switch(config)#errdisable detect cause pagp-flap
Carrier Sense Multiple Access Collision Detection
Switch(config)#interface range macro {name}

17. What is TCAM overflow?
Switch#show interfaces status err-disabled
Switch#show ip cef {interface} [detail]
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

18. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Configure the appropriate values manually on both ends of the link
Switch(config)#errdisable detect cause dtp-flap
Store-and-forward
The CEF epoch number

19. Enables error-disable for errors with dynamic ARP inspection
American National Standards Institute
Configure the appropriate values manually on both ends of the link
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause arp-inspection

20. What is the default duplex mode of a 10 Mbps Ethernet interface?
Half duplex
Route caching and topology based
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Compiling Access Control Entries (ACE) into the TCAM table

21. Selects an interface-range macro and enters interface configuration mode
Logical Operation Unit
Switch(config)#errdisable detect cause link-flap
SC or MT-RJ
Switch(config)#interface range macro {name}

22. Selects multiple switch port interfaces at the same time and enters interface configuration mode
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Switch(config-if)#speed {10 | 100 | 1000 | auto}

23. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Switch(config)#errdisable detect cause dhcp-rate-limit
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
The table of learned MAC addresses - ports - and VLAN information

24. When do collisions occur?
The table of learned MAC addresses - ports - and VLAN information
SC or MT-RJ
When one station transmits at the same time as another on a shared medium
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

25. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
In parallel revealing the best (longest) match in a single table lookup
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
The Punt adjacency
Accelerated CEF (aCEF)

26. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Switch(config)#errdisable detect cause l2ptguard
Switch(config)#errdisable detect cause pagp-flap
Full duplex only
IEEE 802.3

27. Enables automatic re-enabling of error-disabled ports
Switch(config)#errdisable recovery cause {all | {cause-name}}
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch#show cef drop
70 km for 9 micron SMF; 100 km for 8 micron SMF

28. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Interconnecting switches in a campus network
A station must wait its turn to transmit; it can't transmit and receive at the same time
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Native routed interface

29. How are ports that are in error-disable state re-enabled by default?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Manually by administratively disabling and re-enabling the port
S = Short; L = Long; E = Extra-long
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

30. What is 1000BASE-SX?
Interconnecting switches in a campus network
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

31. What information is recorded in CAM as frames arrive on a switch port?
FIB with adjacency table
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Source MAC address; Port of arrival; VLAN; Time stamp
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

32. Creates an interface-range macro
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Full duplex only

33. What combinations are TCAM entries composed of?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch#show cef not-cef-switched
Switch(config)#errdisable detect cause unicast-flood
Value - Mask - and Result (VMR)

34. Displays CEF Punt statistics with number of packets and reason for each line card
Dynamic
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show cef not-cef-switched
Packets that have been truncated before they were fully received

35. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Static access or trunk
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
IEEE 802.3
Institute of Electrical and Electronics Engineers

36. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
Switch(config)#errdisable detect cause channel-misconfig
1000BASE-T full duplex followed by 1000BASE-T half duplex
Logical Operation Unit
LAN PHY and WAN PHY

37. Enables error-disable for the presence of invalid GBIC or SFP modules
Interconnecting switches in a campus network
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#errdisable detect cause udld

38. What connectors can be used with SFP modules?
On
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
LC - MT-RJ or RJ-45

39. What are runts?
Packets that have been truncated before they were fully received
IEEE 802.3ab
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

40. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show interfaces {interface}
Dynamic

41. Displays dynamic CAM table entries
Switch(config-if)#description {string}
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
A switch port that has been shut down automatically due to a serious error condition
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

42. What is the maximum cabling distance for 10GBASE-CX4?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config)#errdisable detect cause arp-inspection
15 metres
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

43. What is the maximum cabling distance for 10GBASE-LR/LW?
Switch(config-if)#switchport access vlan {vlan}
Distributed CEF (dCEF)
Switch(config-if)#shutdown
10 km

44. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Dynamic
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

45. What are the Fast Ethernet autonegotiation selection priorities?
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
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); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Static access or dynamic

46. What is the maximum cabling distance for 10GBASE-SR/SW?
Native routed interface
Logical Operation Unit
Switch(config-if)#no ip route-cache cef
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

47. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Dynamic
Tunnel
Switch(config)#errdisable detect cause vmps
Switch(config)#errdisable detect cause dtp-flap

48. What is CSMA/CD?
Carrier Sense Multiple Access Collision Detection
SC fibre optic or RJ-45 UTP
Switch#show running-config interface {interface}
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

49. What is the content of TCAM Mask entries?

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50. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
ANSI X3T11 FibreChannel
10 km
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#interface vlan {vlan-id}