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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. Displays interface configuration information
Static access or trunk
Accelerated CEF (aCEF)
Switch#show running-config interface {interface}
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

2. 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#show interfaces {interface}
The adjacency table
The Null adjacency

3. What are the reasons for packets being dropped by CEF?
Switch(config)#errdisable detect cause gbic-invalid
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
SVI
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

4. What is Cisco's old recommendation regarding switch port speed and duplex mode?
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
Configure the appropriate values manually on both ends of the link
Tunnel
Switch(config)#errdisable detect cause {all | {cause-name}}

5. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Switch#show ip cef {interface} [detail]
Switch(config)#interface vlan {vlan-id}
The CEF entry version number
Cisco Express Forwarding

6. Enables error-disable detection
The Punt adjacency
Switch(config)#errdisable detect cause {all | {cause-name}}
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Ternary Content-Addressable Memory

7. What CEF optimisation technique cache FIB entries in switch line cards?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
A name assigned to a ranges of interfaces
Accelerated CEF (aCEF)
From 30 seconds to 86 -400 seconds (24 hours)

8. What is the standard for 10 Gigabit Ethernet (10GbE)?
IEEE 802.3ae
By Mask/Value - where each unique mask has eight value patterns associated with it
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
10 km

9. What is the maximum cabling distance for 10GBASE-CX4?
Security and QoS ACLs
15 metres
Electromagnetic Interference
The Discard adjacency

10. When do collisions occur?
40 km
When one station transmits at the same time as another on a shared medium
Switch#show errdisable recovery
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

11. What is the maximum cabling distance for 1000BASE-ZX?
Electromagnetic Interference
Interconnecting switches in a campus network
70 km for 9 micron SMF; 100 km for 8 micron SMF
The table of learned MAC addresses - ports - and VLAN information

12. What is the original standard for Ethernet (10 Mbps)?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
IEEE 802.3
1 -2 on one end with 3 -6 on the other end

13. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Switch(config)#mac address-table aging-time {seconds}
Source MAC address; Port of arrival; VLAN; Time stamp
Tunnel
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

14. What is the name of a Layer 3 physical interface on a switch?
A three-fold combination of 0 - 1 and X (don't care)
Half duplex
Native routed interface
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

15. What is the maximum cabling distance for 10GBASE-LX4/LW4?
They are dropped (ARP throttling)
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#interface {type}{module}/{number}

16. What happens to subsequent packets destined for FIB entries in CEF glean state?
They are dropped (ARP throttling)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Static access - trunk - tunnel or dynamic

17. Displays the CAM table size with number of MAC addresses
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
FIB with adjacency table
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
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

18. What is the standard for Fast Ethernet (100 Mbps)?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
The switch port falls back to default setting of half duplex
Off
IEEE 802.3u

19. What CEF adjacency is used to switch packets that can't be forwarded normally?
R = LAN PHY; W = WAN PHY
The Drop adjacency
Value - Mask - and Result (VMR)
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

20. Creates a switched virtual interface (SVI) and enters interface configuration mode
Logical Operation Unit
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch(config)#interface vlan {vlan-id}
Content-Addressable Memory

21. What is the maximum cabling distance for 10GBASE-ER/EW?
On
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
40 km
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

22. What is the standard for Gigabit Ethernet (1000 Mbps)?
Switch#show ip cef {interface} [detail]
ANSI X3T11 FibreChannel
IEEE 802.3z
Static access - trunk - tunnel or dynamic

23. What is the default duplex mode of a 10 Mbps Ethernet interface?
IEEE 802.3ab
10 km
Half duplex
Switched virtual interface (SVI)

24. Displays error-disabled detection status
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Layer 3 forwarding engine
Switch#show errdisable detect
Switch(config)#errdisable detect cause link-flap

25. What is 1000BASE-CX?
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#errdisable detect cause unicast-flood

26. What is the TCAM Value and Mask for an IGMP access list?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
By Mask/Value - where each unique mask has eight value patterns associated with it
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
CEF glean

27. What are the common cabling specifications for Gigabit Ethernet?
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
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Static access - trunk - tunnel or dynamic
Switch(config-if)#duplex {auto | full | half}

28. What information is stored in TCAM?
IEEE 802.3u
Security and QoS ACLs
Switch(config)#errdisable detect cause l2ptguard
Switch#show ip cef

29. How are MAC addresses shown in the detailed output from the CEF adjacency table?
70 km for 9 micron SMF; 100 km for 8 micron SMF
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 Layer 3 forwarding engine
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

30. What are the common cabling specifications for Fast Ethernet?
On
SC or MT-RJ
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
They are dropped (ARP throttling)

31. What connectors can be used with GBIC modules?
The CEF entry version number
SC fibre optic or RJ-45 UTP
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config-if)#no switchport

32. What are the names of the two basic generations of MLS?
Route caching and topology based
LC - MT-RJ or RJ-45
The Discard adjacency
IEEE 802.3ab

33. What is CSMA/CD?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Carrier Sense Multiple Access Collision Detection
Packets that have been truncated before they were fully received
LC - MT-RJ or RJ-45

34. What is the operational mode of a switch port that carries traffic for multiple VLANs?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
CEF glean
Multilayer Switching
Trunk

35. What are runts?
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
Packets that have been truncated before they were fully received
Interconnecting switches in a campus network
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)

36. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
300 seconds
10 km
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

37. What is 1000BASE-T?
The table of learned MAC addresses - ports - and VLAN information
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
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
ANSI X3T11 FibreChannel

38. What is 10GBASE-ER/EW?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

39. What is the standard for 1000BASE-T?
Switch(config)#errdisable detect cause dhcp-rate-limit
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
IEEE 802.3ab
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

40. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable detect cause unicast-flood
Full duplex only

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

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42. What is IEEE?
Switch#show interfaces status
Switch#show cef drop
Institute of Electrical and Electronics Engineers
LAN PHY and WAN PHY

43. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
In TCAM Value entries

44. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Switch(config)#errdisable detect cause bpduguard
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Punt adjacency
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

45. What is the name of physical network segment where data packets can collide with one another when being sent?
The Layer 3 forwarding engine
Switch(config)#errdisable detect cause udld
Collision domain
Security and QoS ACLs

46. What is 10BASE-T?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config-if)#description {string}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Half duplex

47. What is the TCAM Value and Mask for an IP access list?
The CEF epoch number
Switch#show interfaces status
1 -2 on one end with 3 -6 on the other end
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

48. What is 1000BASE-LX/LH?
Switch(config)#errdisable detect cause l2ptguard
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Routing table and ARP table
Carrier Sense Multiple Access Collision Detection

49. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Switch(config)#errdisable detect cause udld
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
10 km
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

50. What are the operational modes of a Layer 2 switched interface?
A three-fold combination of 0 - 1 and X (don't care)
XENPAK - X2 - or SFP+
Down - static access - trunk or tunnel
Enable error-disable for all possible causes