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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 connectors can be used with GBIC modules?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Electromagnetic Interference
SC fibre optic or RJ-45 UTP
Switch(config)#errdisable recovery cause {all | {cause-name}}

2. What is the standard for 1000BASE-T?
SVI or native routed interface
UTP Fast Ethernet and Gigabit Ethernet
IEEE 802.3ab
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

3. Enables error-disable for misconfiguration of EtherChannel bundles
Wide-Wavelength Division Multiplexing
Switch(config-if)#description {string}
Electromagnetic Interference
Switch(config)#errdisable detect cause channel-misconfig

4. What information is stored in TCAM?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable detect cause pagp-flap
Switch(config)#errdisable detect cause vmps
Security and QoS ACLs

5. What is 1000BASE-T?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
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
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
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

6. What is IEEE?
Switch#show interfaces {interface}
From 30 seconds to 86 -400 seconds (24 hours)
Compiling Access Control Entries (ACE) into the TCAM table
Institute of Electrical and Electronics Engineers

7. What is 1000BASE-X?
Cabling specifications for Gigabit Ethernet
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
LC - MT-RJ or RJ-45
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

8. What is error-disable state?
The CEF epoch number
A switch port that has been shut down automatically due to a serious error condition
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Static access

9. Displays error-disabled recovery timer information
LC - MT-RJ or RJ-45
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch#show errdisable recovery

10. What CEF adjacency is used to switch packets that can't be forwarded normally?
Accelerated CEF (aCEF)
The adjacency table
Switch#show interfaces status err-disabled
The Drop adjacency

11. What is a SVI?
IEEE 802.3ae
Switch(config)#errdisable detect cause rootguard
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switched virtual interface (SVI)

12. What is full duplex operation?
American National Standards Institute
Static access
10 km
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

13. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
The switch port falls back to default setting of half duplex
Wide-Wavelength Division Multiplexing

14. What is the name of the CEF engine that forwards packets in hardware?
The Layer 3 forwarding engine
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config)#errdisable detect cause gbic-invalid

15. How is the TCAM organised?
By Mask/Value - where each unique mask has eight value patterns associated with it
LC - MT-RJ or RJ-45
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Off

16. Specifies the timer for automatic re-enabling of error-disabled ports
Switch(config)#errdisable recovery interval {seconds}
Switch(config)#errdisable detect cause gbic-invalid
Half duplex
SVI

17. Displays a list with status of all interfaces
Switch(config)#errdisable detect cause gbic-invalid
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Full duplex only
Switch#show interfaces status

18. What is the TCAM Value and Mask for an ICMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
SVI

19. What are the types of layer 3 switched interfaces
Switch(config-if)#duplex {auto | full | half}
SVI or native routed interface
SVI
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

20. Displays error-disabled detection status
Switch(config)#errdisable detect cause pagp-flap
Feature Manager (FM) and Switching Database Manager (SDM)
Switch#show errdisable detect
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

21. What tables are maintained by the CEF Layer 3 forwarding engine?
FIB with adjacency table
SC fibre optic or RJ-45 UTP
Enable error-disable for all possible causes
1000BASE-T full duplex followed by 1000BASE-T half duplex

22. What function is performed by the Feature Manager (FM)?
The table of learned MAC addresses - ports - and VLAN information
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Compiling Access Control Entries (ACE) into the TCAM table
70 km for 9 micron SMF; 100 km for 8 micron SMF

23. Displays dynamic CAM table entries
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
ANSI X3T11 FibreChannel
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
IEEE 802.3

24. What is 10GBASE-LR/LW?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Trunk
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

25. What is the default duplex mode of a Gigabit Ethernet interface?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Full duplex
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
FIB with adjacency table

26. Adds a static entry to the MAC address table
Slow response times - low throughput - runts and other input errors on the switch ports
Half duplex
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
LOU registers

27. What is the name of physical network segment where data packets can collide with one another when being sent?
Collision domain
Source MAC address; Port of arrival; VLAN; Time stamp
Trunk
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

28. What Ethernet ports allow for autonegotiation?
UTP Fast Ethernet and Gigabit Ethernet
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

29. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
1000BASE-T full duplex followed by 1000BASE-T half duplex
Dynamic
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

30. What is the administrative mode of a switch port that is a member of one VLAN?
Static access or dynamic
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
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
From 30 seconds to 86 -400 seconds (24 hours)

31. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
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)
Full duplex
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

32. What are the symptoms of a duplex setting mismatch between two ends of a link?
Switch(config-if)#switchport mode access
The Punt adjacency
Switch(config)#errdisable detect cause gbic-invalid
Slow response times - low throughput - runts and other input errors on the switch ports

33. What is the maximum cabling distance for 1000BASE-ZX?
100 metres
Distributed CEF (dCEF)
70 km for 9 micron SMF; 100 km for 8 micron SMF
The table of learned MAC addresses - ports - and VLAN information

34. What is half duplex operation?

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35. Sets the administrative mode of a switch port to access
Switch(config-if)#switchport mode access
XENPAK - X2 - or SFP+
R = LAN PHY; W = WAN PHY
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

36. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch(config)#interface {type}{module}/{number}
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
In TCAM Value entries

37. What is 10GBASE-X?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Cabling specifications for 10 Gigabit Ethernet
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch#show interfaces {interface} switchport

38. What is the original standard for Ethernet (10 Mbps)?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
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
Wide-Wavelength Division Multiplexing
IEEE 802.3

39. What two IOS software components are involved in TCAM operation?
Switch(config)#errdisable detect cause psecure-violation
Dynamic
Feature Manager (FM) and Switching Database Manager (SDM)
The Drop adjacency

40. Enables error-disable for errors related to 802.1x security
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch(config)#errdisable detect cause security-violation
Switch#show cef drop
SC or MT-RJ

41. What is the maximum cabling distance for 10GBASE-ER/EW?
40 km
Switch(config)#errdisable detect cause storm-control
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#errdisable detect cause unicast-flood

42. Adds a description to an interface configuration
Switch(config)#errdisable detect cause bpduguard
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch#show errdisable recovery
Switch(config-if)#description {string}

43. What are runts?
Switch(config)#errdisable detect cause ilpower
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Packets that have been truncated before they were fully received
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

44. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
10GbE operates only at full duplex
When one station transmits at the same time as another on a shared medium
Tunnel
On

45. How do Layer 2 switches provide isolation between hosts?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switched virtual interface (SVI)
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

46. What information is stored in CAM?
FIB with adjacency table
The table of learned MAC addresses - ports - and VLAN information
Feature Manager (FM) and Switching Database Manager (SDM)
UTP Fast Ethernet and Gigabit Ethernet

47. Displays administrative and operational status for a specified interface
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch#show interfaces {interface}
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

48. Displays the contents of the CAM table
Enable error-disable for all possible causes
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause arp-inspection
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

49. Selects an interface-range macro and enters interface configuration mode
Numeric values that represent what action to take after the TCAM lookup occurs
Logical Operation Unit
Switch(config)#interface range macro {name}
Security and QoS ACLs

50. What is 1000BASE-LX/LH?
Native routed interface
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)