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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 prerequesite for creating a working SVI?
The Null adjacency
Creating the VLAN
The switch port falls back to default setting of half duplex
LOU registers

2. What information is stored in CAM?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
The table of learned MAC addresses - ports - and VLAN information
IEEE 802.3ab
300 seconds

3. What is 100BASE-TX?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause unicast-flood
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

4. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
A switch port that has been shut down automatically due to a serious error condition
100 metres
Switch(config-if)#duplex {auto | full | half}
Store-and-forward

5. What is the maximum cabling distance for 10GBASE-CX4?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
15 metres
By Mask/Value - where each unique mask has eight value patterns associated with it
Down - static access - trunk or tunnel

6. How is link speed determined on Fast Ethernet links configured to autonegotiate?
Switch(config)#errdisable recovery cause {all | {cause-name}}
10GbE operates only at full duplex
Cisco Express Forwarding
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

7. 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
1 -2 on one end with 3 -6 on the other end
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
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

8. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Compiling Access Control Entries (ACE) into the TCAM table
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 Layer 3 forwarding engine
Switch(config)#errdisable detect cause l2ptguard

9. Displays a list with status of all interfaces
Switch#show interfaces status
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

10. What is EMI?
Value - Mask - and Result (VMR)
Institute of Electrical and Electronics Engineers
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Electromagnetic Interference

11. What is the standard for 1000BASE-T?
IEEE 802.3ab
LC - MT-RJ or RJ-45
Switch(config-if)#duplex {auto | full | half}
Switch(config)#interface vlan {vlan-id}

12. What are runts?
Packets that have been truncated before they were fully received
Switch#show adjacency [{interface}] [summary | detail]
By Mask/Value - where each unique mask has eight value patterns associated with it
1000BASE-T full duplex followed by 1000BASE-T half duplex

13. Removes entries from the CAM table
IEEE 802.3z
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Slow response times - low throughput - runts and other input errors on the switch ports

14. What are the operational modes of a Layer 2 switched interface?
300 seconds
Down - static access - trunk or tunnel
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config-if)#shutdown

15. Enables error-disable for errors with offering inline power
Switch(config)#errdisable detect cause ilpower
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
The CEF epoch number
Switch(config)#errdisable detect cause gbic-invalid

16. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
Switch(config)#errdisable detect cause loopback
400 metres half duplex and 2000 metres full duplex
Interconnecting switches in a campus network
R = LAN PHY; W = WAN PHY

17. What are the common cabling specifications for Gigabit Ethernet?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Full duplex
Wide-Wavelength Division Multiplexing
1 -2 on one end with 3 -6 on the other end

18. What tables are maintained by the CEF Layer 3 forwarding engine?
FIB with adjacency table
The switch port falls back to default setting of half duplex
Switch(config-if)#switchport access vlan {vlan}
A name assigned to a ranges of interfaces

19. Displays a list of all interfaces in an error-disabled state
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
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
Switch#show interfaces status err-disabled

20. What two IOS software components are involved in TCAM operation?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Feature Manager (FM) and Switching Database Manager (SDM)
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

21. What is 1000BASE-CX?
Switch(config-if)#description {string}
Static access
By Mask/Value - where each unique mask has eight value patterns associated with it
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

22. What is 1000BASE-LX/LH?
The CEF epoch number
A three-fold combination of 0 - 1 and X (don't care)
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Switch(config)#errdisable detect cause bpduguard

23. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
CEF punt
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
Switch(config-if)#shutdown
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

24. What is 1000BASE-X?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Cabling specifications for Gigabit Ethernet
Institute of Electrical and Electronics Engineers
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

25. What is a ternary combination?

26. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
The Punt adjacency
Interconnecting switches in a campus network
The Null adjacency

27. What is the role of a Route Processor (RP) in first generation MLS?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Process the first packet in a traffic flow to determine the destination
SC fibre optic or RJ-45 UTP
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

28. Enables error-disable for errors related to 802.1x security
Switch(config)#default interface {interface}
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
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
Switch(config)#errdisable detect cause security-violation

29. How is the TCAM organised?
Content-Addressable Memory
By Mask/Value - where each unique mask has eight value patterns associated with it
American National Standards Institute
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

30. How do Layer 2 switches provide isolation between hosts?
Dynamic
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Packets that have been truncated before they were fully received
Wide-Wavelength Division Multiplexing

31. Adds a description to an interface configuration
LC - MT-RJ or RJ-45
Switch(config-if)#description {string}
IEEE 802.3
From 30 seconds to 86 -400 seconds (24 hours)

32. What is the DTP negotiation mode of a switch port configured as dynamic?
On
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config-if)#shutdown
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

33. Creates an interface-range macro
Switch(config-if)#duplex {auto | full | half}
Carrier Sense Multiple Access Collision Detection
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

34. What tables are maintained by the CEF Layer 3 engine?
A name assigned to a ranges of interfaces
LAN PHY and WAN PHY
Switch(config)#errdisable detect cause dhcp-rate-limit
Routing table and ARP table

35. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
15 metres
Full duplex only
Routing table and ARP table

36. What is 100BASE-T4?
The switch port falls back to default setting of half duplex
1 -2 on one end with 3 -6 on the other end
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
IEEE 802.3u

37. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Switch(config)#errdisable detect cause arp-inspection
The Drop adjacency
Switch(config)#errdisable detect cause l2ptguard
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

38. What is error-disable state?
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
A switch port that has been shut down automatically due to a serious error condition
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Partition and tune the TCAM on some Catalyst switches into areas for different functions

39. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Switch(config)#errdisable detect cause loopback
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config)#errdisable detect cause pagp-flap
Tunnel

40. What is the operational mode of a switch port that uses DTP negotiation?
Static access or trunk
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Native routed interface
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

41. Displays the CAM table size with number of MAC addresses
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
IEEE 802.3u
Switch(config)#no ip cef
Static access - trunk - tunnel or dynamic

42. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Tunnel
On
Switch(config)#errdisable detect cause dhcp-rate-limit

43. What is IEEE?
CEF punt
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 unicast-flood
Institute of Electrical and Electronics Engineers

44. What is the default age-out time for stale entries in the CAM table?
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
300 seconds
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

45. What is the maximum cabling distance for 10GBASE-LR/LW?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
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
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
10 km

46. What CEF optimisation technique cache FIB entries in switch line cards?
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
Accelerated CEF (aCEF)
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
1 -2 on one end with 3 -6 on the other end

47. What is the TCAM Value and Mask for an IPX access list?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
The adjacency table
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
A three-fold combination of 0 - 1 and X (don't care)

48. What is the content of TCAM Mask entries?

49. What is half duplex operation?

50. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
LOU registers
Dynamic
Switch(config)#errdisable detect cause vmps