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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 are the common cabling specifications for Gigabit Ethernet?
Switch(config)#errdisable detect cause loopback
When one station transmits at the same time as another on a shared medium
With a mask value in addition to binary values to decide which keys in a table are relevant
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

2. What are the default error-disable detection causes?
Half duplex
Enable error-disable for all possible causes
Full duplex
Switch(config)#errdisable detect cause link-flap

3. What are the types of layer 3 switched interfaces
Switch(config)#errdisable detect cause {all | {cause-name}}
SVI or native routed interface
Switch#show interfaces {interface}
Trunk or dynamic

4. What two IOS software components are involved in TCAM operation?
Feature Manager (FM) and Switching Database Manager (SDM)
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)#errdisable detect cause security-violation
Interconnecting switches in a campus network

5. Displays dynamic CAM table entries
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
IEEE 802.3u
Switch(config-if)#speed {10 | 100 | 1000 | auto}

6. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
The Layer 3 engine
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Store-and-forward

7. What is EMI?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Electromagnetic Interference
Partition and tune the TCAM on some Catalyst switches into areas for different functions
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. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
100 metres
The table of learned MAC addresses - ports - and VLAN information
Trunk or dynamic
Source MAC address; Port of arrival; VLAN; Time stamp

9. Displays CEF Punt statistics with number of packets and reason for each line card
Carrier Sense Multiple Access Collision Detection
Switch#show cef not-cef-switched
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
IEEE 802.3

10. What denotes the number of times a CEF entry has been updated since the CEF table was created?
Switch(config)#errdisable detect cause unicast-flood
The CEF entry version number
Switch(config)#errdisable detect cause dhcp-rate-limit
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

11. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
The Punt adjacency
Switch(config)#no ip cef

12. What is the original standard for Ethernet (10 Mbps)?
Store-and-forward
IEEE 802.3
Half duplex
Interconnecting switches in a campus network

13. What is the name of the CEF engine that forwards packets in hardware?
By Mask/Value - where each unique mask has eight value patterns associated with it
The Layer 3 forwarding engine
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
1 -2 on one end with 3 -6 on the other end

14. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
The Discard adjacency
LOU registers
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
The adjacency table

15. What is TCAM overflow?
Switch(config)#errdisable recovery cause {all | {cause-name}}
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
The Punt adjacency

16. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Tunnel
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

17. What is full duplex operation?
In parallel revealing the best (longest) match in a single table lookup
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Switch(config)#errdisable detect cause link-flap

18. What is the default age-out time for stale entries in the CAM table?
300 seconds
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
The table of learned MAC addresses - ports - and VLAN information
Switch(config-if)#switchport mode access

19. What is 10GBASE-SR/SW?
S = Short; L = Long; E = Extra-long
R = LAN PHY; W = WAN PHY
Packets that have been truncated before they were fully received
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

20. What is the maximum cabling distance for 10GBASE-LX4/LW4?
FIB with adjacency table
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Numeric values that represent what action to take after the TCAM lookup occurs

21. What is 1000BASE-T?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch#show interfaces {interface} switchport
SVI
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

22. Enables error-disable detection
Switch(config)#errdisable detect cause {all | {cause-name}}
Security and QoS ACLs
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

23. What is WWDM?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switched virtual interface (SVI)
Wide-Wavelength Division Multiplexing
Only temporarily for debugging purposes

24. What happens to subsequent packets destined for FIB entries in CEF glean state?
Switch#show adjacency [{interface}] [summary | detail]
They are dropped (ARP throttling)
Compiling Access Control Entries (ACE) into the TCAM table
By Mask/Value - where each unique mask has eight value patterns associated with it

25. What is MLS?
Multilayer Switching
Half duplex
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

26. What function is performed by the Feature Manager (FM)?
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
Slow response times - low throughput - runts and other input errors on the switch ports
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Compiling Access Control Entries (ACE) into the TCAM table

27. What tables are maintained by the CEF Layer 3 engine?
10 km
Switch(config-if)#switchport mode access
The Null adjacency
Routing table and ARP table

28. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
SC fibre optic or RJ-45 UTP
Switch(config-if)#duplex {auto | full | half}
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

29. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Compiling Access Control Entries (ACE) into the TCAM table
The Punt adjacency
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

30. Creates an interface-range macro
Switch#show adjacency [{interface}] [summary | detail]
Switch#show cef drop
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

31. What is the maximum cabling distance for 1000BASE-LX/LH?
IEEE 802.3ab
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
LAN PHY and WAN PHY
Cabling specifications for 10 Gigabit Ethernet

32. Displays administrative and operational status for a specified interface
Off
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch#show interfaces {interface}
Tunnel

33. What is error-disable state?
LAN PHY and WAN PHY
Switch(config-if)#no switchport
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
A switch port that has been shut down automatically due to a serious error condition

34. Enables error-disable when a storm control threshold has been exceeded on a port
The adjacency table
Switch(config)#errdisable recovery interval {seconds}
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch(config)#errdisable detect cause storm-control

35. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
1000BASE-T full duplex followed by 1000BASE-T half duplex
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)
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable detect cause vmps

36. What is 1000BASE-SX?
Switch#show ip cef {interface} [detail]
The switch port falls back to default setting of half duplex
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Slow response times - low throughput - runts and other input errors on the switch ports

37. Displays CEF Drop statistics with number of packets and reason for each line card
Switch#show cef drop
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Electromagnetic Interference
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

38. Displays a list with status of all interfaces
ANSI X3T11 FibreChannel
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show interfaces status

39. What is the default duplex mode of a Gigabit Ethernet interface?
Slow response times - low throughput - runts and other input errors on the switch ports
From 30 seconds to 86 -400 seconds (24 hours)
Full duplex
IEEE 802.3u

40. Adds a description to an interface configuration
Switch(config)#interface vlan {vlan-id}
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switched virtual interface (SVI)
Switch(config-if)#description {string}

41. 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
100 metres
Static access - trunk - tunnel or dynamic
On

42. What is the TCAM Value and Mask for an ICMP access list?
SC fibre optic or RJ-45 UTP
Switch#show ip cef
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

43. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch#show ip cef {interface} [detail]
Full duplex only
CEF glean

44. Specifies the timer for automatic re-enabling of error-disabled ports
Switch(config)#errdisable detect cause psecure-violation
Only temporarily for debugging purposes
A three-fold combination of 0 - 1 and X (don't care)
Switch(config)#errdisable recovery interval {seconds}

45. What is the timer range for automatic re-enabling of error-disabled ports?
S = Short; L = Long; E = Extra-long
The Discard adjacency
From 30 seconds to 86 -400 seconds (24 hours)
Switch#show errdisable recovery

46. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch(config)#errdisable detect cause {all | {cause-name}}

47. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Switch(config)#errdisable detect cause udld
Dynamic
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
XENPAK - X2 - or SFP+

48. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable detect cause gbic-invalid
Switch#show cef drop
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch(config)#no ip cef

49. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
XENPAK - X2 - or SFP+
Multilayer Switching
Switched virtual interface (SVI)
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

50. Adds a static entry to the MAC address table
Security and QoS ACLs
IEEE 802.3z
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
From 30 seconds to 86 -400 seconds (24 hours)