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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 maximum cabling distance for 10GBASE-CX4?
Switch#show interfaces status err-disabled
15 metres
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show cef drop

2. What is the name of a Layer 3 physical interface on a switch?
Native routed interface
Value - Mask - and Result (VMR)
Store-and-forward
IEEE 802.3u

3. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch#show running-config interface {interface}
Accelerated CEF (aCEF)
The Layer 3 forwarding engine

4. Enables error-disable for rate-limiting of DHCP snooping
The Discard adjacency
The table of learned MAC addresses - ports - and VLAN information
Slow response times - low throughput - runts and other input errors on the switch ports
Switch(config)#errdisable detect cause dhcp-rate-limit

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

6. What is the TCAM Value and Mask for an IGMP access list?
Full duplex
Switch(config)#errdisable detect cause vmps
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
15 metres

7. Selects a switch port interface and enters interface configuration mode
CEF glean
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(config)#interface {type}{module}/{number}
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

8. Configures the maximum ageing time for entries in the MAC address table
SVI or native routed interface
The table of learned MAC addresses - ports - and VLAN information
Down - static access - trunk or tunnel
Switch(config)#mac address-table aging-time {seconds}

9. How are ternary combinations implemented?
With a mask value in addition to binary values to decide which keys in a table are relevant
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
400 metres half duplex and 2000 metres full duplex
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

10. What is half duplex operation?

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11. What is 10GBASE-SR/SW?
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
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
300 seconds
Switch(config)#errdisable detect cause l2ptguard

12. What CEF optimisation technique cache FIB entries in switch line cards?
Slow response times - low throughput - runts and other input errors on the switch ports
The CEF epoch number
SVI
Accelerated CEF (aCEF)

13. What is the role of a Route Processor (RP) in first generation MLS?
Institute of Electrical and Electronics Engineers
Process the first packet in a traffic flow to determine the destination
The Layer 3 engine
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

14. What is error-disable state?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
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
A switch port that has been shut down automatically due to a serious error condition

15. What is the standard for 1000BASE-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
IEEE 802.3ab
A name assigned to a ranges of interfaces
Switch(config)#interface {type}{module}/{number}

16. Displays dynamic CAM table entries
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch#show adjacency [{interface}] [summary | detail]
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

17. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Slow response times - low throughput - runts and other input errors on the switch ports
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
LAN PHY and WAN PHY
The Null adjacency

18. What is the maximum cabling distance for 1000BASE-ZX?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
70 km for 9 micron SMF; 100 km for 8 micron SMF
When one station transmits at the same time as another on a shared medium
The Null adjacency

19. What are the common PMD types for 10 Gigabit Ethernet?
Routing table and ARP table
Switch(config-if)#speed {10 | 100 | 1000 | auto}
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Switched virtual interface (SVI)

20. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Switch#show running-config interface {interface}
SC or MT-RJ
The adjacency table
ANSI X3T11 FibreChannel

21. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
The table of learned MAC addresses - ports - and VLAN information
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 adjacency table

22. What is the content of TCAM Result entries?
Switch(config)#errdisable detect cause pagp-flap
Switch(config)#errdisable detect cause arp-inspection
Ternary Content-Addressable Memory
Numeric values that represent what action to take after the TCAM lookup occurs

23. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Configure the appropriate values manually on both ends of the link
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Route caching and topology based
The switch port falls back to default setting of half duplex

24. Enables error-disable for errors with offering inline power
Half duplex
Switch(config)#errdisable detect cause ilpower
Native routed interface
A station must wait its turn to transmit; it can't transmit and receive at the same time

25. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
300 seconds
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
CEF glean
LAN PHY and WAN PHY

26. What is EMI?
Switch#show cef drop
In parallel revealing the best (longest) match in a single table lookup
Content-Addressable Memory
Electromagnetic Interference

27. What are the Gigabit Ethernet autonegotiation selection priorities?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Cabling specifications for 10 Gigabit Ethernet
When one station transmits at the same time as another on a shared medium
1000BASE-T full duplex followed by 1000BASE-T half duplex

28. When do collisions occur?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
When one station transmits at the same time as another on a shared medium
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

29. What is the prerequesite for creating a working SVI?
Switch#show interfaces status err-disabled
Creating the VLAN
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Trunk or dynamic

30. What are the administrative modes of Layer 2 switched interfaces?
Creating the VLAN
Switch(config)#errdisable detect cause unicast-flood
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Static access - trunk - tunnel or dynamic

31. What is a SVI?
Slow response times - low throughput - runts and other input errors on the switch ports
Switched virtual interface (SVI)
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)

32. Displays switch port information for a specified interface
Switch(config)#interface range macro {name}
10 km
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show interfaces {interface} switchport

33. What is 10BASE-T?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
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)#mac address-table aging-time {seconds}
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

34. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Trunk or dynamic
Configure the appropriate values manually on both ends of the link
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Full duplex only

35. What are the reasons for packets being dropped by CEF?
Static access
400 metres half duplex and 2000 metres full duplex
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Routing table and ARP table

36. What information is recorded in CAM as frames arrive on a switch port?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
300 seconds
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable detect cause link-flap

37. Displays entries in the Forwarding Information Base (FIB) for a specific interface
15 metres
Switch#show ip cef {interface} [detail]
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch#show interfaces {interface}

38. What function is performed by the Feature Manager (FM)?
Compiling Access Control Entries (ACE) into the TCAM table
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
CEF punt

39. What is the timer range for automatic re-enabling of error-disabled ports?
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config)#errdisable detect cause loopback
Switch#show cef drop
Switch(config)#errdisable recovery interval {seconds}

40. What are the names of the two basic generations of MLS?
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Static access or trunk
Route caching and topology based

41. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
On
Switch(config)#errdisable detect cause dhcp-rate-limit
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10GbE operates only at full duplex

42. What is 100BASE-T4?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

43. What is 1000BASE-LX/LH?
UTP Fast Ethernet and Gigabit Ethernet
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
1 -2 on one end with 3 -6 on the other end
Electromagnetic Interference

44. What is 10GBASE-X?
Cabling specifications for 10 Gigabit Ethernet
Only temporarily for debugging purposes
Switched virtual interface (SVI)
Off

45. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
In TCAM Value entries
Switch(config)#errdisable detect cause vmps
IEEE 802.3ab

46. Enables error-disable when trunking encapsulation is flapping from one type to another
Store-and-forward
Switch(config)#errdisable detect cause dtp-flap
A name assigned to a ranges of interfaces
10 km

47. What is the name of the CEF engine that forwards packets in hardware?
Switch(config-if)#switchport mode access
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
The Layer 3 forwarding engine
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

48. Enables error-disable when a storm control threshold has been exceeded on a port
300 seconds
Switch#show adjacency [{interface}] [summary | detail]
Switch(config)#errdisable detect cause storm-control
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

49. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Switch(config-if)#description {string}
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
CEF punt
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

50. What is the default age-out time for stale entries in the CAM table?
Tunnel
300 seconds
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 errdisable detect