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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 original standard for Ethernet (10 Mbps)?
Switch(config)#interface vlan {vlan-id}
IEEE 802.3
Switch(config)#errdisable detect cause storm-control
Interconnecting switches in a campus network

2. What is full duplex operation?
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#errdisable detect cause loopback
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

3. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
Switch#show interfaces status
The Null adjacency
CEF glean
American National Standards Institute

4. What is the standard for Gigabit Ethernet (1000 Mbps)?
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#interface {type}{module}/{number}
Switch(config-if)#duplex {auto | full | half}
IEEE 802.3z

5. What is CAM?
Manually by administratively disabling and re-enabling the port
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Content-Addressable Memory

6. What is the TCAM Value and Mask for an IP access list?
When one station transmits at the same time as another on a shared medium
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

7. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Wide-Wavelength Division Multiplexing
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
IEEE 802.3
Switch#show ip cef {interface} [detail]

8. Displays the entire Forwarding Information Base (FIB)
Switch#show ip cef
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
S = Short; L = Long; E = Extra-long
Feature Manager (FM) and Switching Database Manager (SDM)

9. Removes entries from the CAM table
IEEE 802.3u
A station must wait its turn to transmit; it can't transmit and receive at the same time
Switch(config)#errdisable detect cause loopback
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

10. What is ANSI?
400 metres half duplex and 2000 metres full duplex
Ternary Content-Addressable Memory
American National Standards Institute
Switch(config-if)#speed {10 | 100 | 1000 | auto}

11. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch#show interfaces {interface}
Down - static access - trunk or tunnel
Switch(config)#errdisable detect cause vmps

12. What is WWDM?
Wide-Wavelength Division Multiplexing
Value - Mask - and Result (VMR)
Cabling specifications for Gigabit Ethernet
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

13. What is the maximum cabling distance for 10GBASE-LR/LW?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
10 km
Off
Static access

14. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch(config)#interface vlan {vlan-id}
Switch#show adjacency [{interface}] [summary | detail]
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
IEEE 802.3

15. What is the standard for Fast Ethernet (100 Mbps)?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
25 metres
Enable error-disable for all possible causes
IEEE 802.3u

16. What is the default duplex mode of a Fast Ethernet interface?
Half duplex
Switch(config-if)#switchport access vlan {vlan}
300 seconds
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

17. What is 100BASE-TX?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch(config)#interface vlan {vlan-id}
UTP Fast Ethernet and Gigabit Ethernet

18. What is 100BASE-T4?
Switch(config)#errdisable detect cause udld
Switch(config)#errdisable detect cause channel-misconfig
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
A three-fold combination of 0 - 1 and X (don't care)

19. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Manually by administratively disabling and re-enabling the port
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)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

20. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
On
By Mask/Value - where each unique mask has eight value patterns associated with it
SVI
100 metres

21. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Store-and-forward
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch(config-if)#speed {10 | 100 | 1000 | auto}
IEEE 802.3u

22. What is the default duplex mode of a 10 Mbps Ethernet interface?
Switch(config)#errdisable detect cause bpduguard
Half duplex
Switch(config)#errdisable detect cause gbic-invalid
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

23. Displays error-disabled recovery timer information
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch#show errdisable recovery
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

24. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
300 seconds
The Punt adjacency

25. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Dynamic
Cabling specifications for 10 Gigabit Ethernet
Switch(config-if)#description {string}

26. What is CSMA/CD?
Switch(config)#errdisable detect cause dhcp-rate-limit
A station must wait its turn to transmit; it can't transmit and receive at the same time
Carrier Sense Multiple Access Collision Detection
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

27. What is 10GBASE-X?
On
Cabling specifications for 10 Gigabit Ethernet
Switch(config-if)#switchport access vlan {vlan}
Half duplex

28. What is TCAM overflow?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
The table of learned MAC addresses - ports - and VLAN information

29. How are ternary combinations implemented?
Off
With a mask value in addition to binary values to decide which keys in a table are relevant
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
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

30. Configures a switch port with a static access VLAN assignment
The table of learned MAC addresses - ports - and VLAN information
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#interface {type}{module}/{number}
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

31. What is the prerequesite for creating a working SVI?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Full duplex
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Creating the VLAN

32. Disables CEF operation globally
Tunnel
Switch(config)#interface range macro {name}
Switch(config)#no ip cef
Compiling Access Control Entries (ACE) into the TCAM table

33. What information is stored in TCAM?
Switch(config)#errdisable detect cause dtp-flap
Security and QoS ACLs
By Mask/Value - where each unique mask has eight value patterns associated with it
A three-fold combination of 0 - 1 and X (don't care)

34. What is the TCAM Value and Mask for an Ethernet access list?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause dhcp-rate-limit

35. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Switch#show adjacency [{interface}] [summary | detail]
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Enable error-disable for all possible causes

36. What CEF adjacency is used to switch packets destined for the null interface?
10 km
Switch#show running-config interface {interface}
The Drop adjacency
The Null adjacency

37. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
1000BASE-T full duplex followed by 1000BASE-T half duplex
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Static access - trunk - tunnel or dynamic
A three-fold combination of 0 - 1 and X (don't care)

38. What is the maximum cabling distance for 1000BASE-CX?
IEEE 802.3u
Full duplex
25 metres
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding

39. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause rootguard
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
300 seconds
Content-Addressable Memory

40. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
UTP Fast Ethernet and Gigabit Ethernet
When one station transmits at the same time as another on a shared medium
Configure the appropriate values manually on both ends of the link

41. What is 10GBASE-ER/EW?
Switch(config)#errdisable detect cause gbic-invalid
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch(config-if)#speed {10 | 100 | 1000 | auto}

42. Enables error-disable for errors with offering inline power
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
IEEE 802.3u
Switch(config)#errdisable detect cause ilpower

43. What is the TCAM Value and Mask for an IPX access list?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
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

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

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45. What is the standard for 1000BASE-T?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
IEEE 802.3ab
Switch(config)#errdisable detect cause arp-inspection

46. What is unknown unicast flooding?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
A three-fold combination of 0 - 1 and X (don't care)
Switch#show errdisable detect
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

47. Enables error-disable for errors with Layer 2 Protocol Tunnelling
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
IEEE 802.3z
Switch(config)#errdisable detect cause l2ptguard
Switch#show interfaces {interface}

48. What is error-disable state?
FIB with adjacency table
Switch(config)#errdisable detect cause loopback
When one station transmits at the same time as another on a shared medium
A switch port that has been shut down automatically due to a serious error condition

49. What is the maximum cabling distance for 1000BASE-ZX?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch#show errdisable recovery
Switch#show interfaces {interface} switchport

50. What is 1000BASE-CX?
Half duplex
IEEE 802.3ae
Switch(config)#errdisable detect cause vmps
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling