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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. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Full duplex only
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
In TCAM Value entries
Half duplex

2. What is unknown unicast flooding?
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable detect cause channel-misconfig

3. Displays administrative and operational status for a specified interface
IEEE 802.3z
Static access
R = LAN PHY; W = WAN PHY
Switch#show interfaces {interface}

4. Displays dynamic CAM table entries
A switch port that has been shut down automatically due to a serious error condition
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show interfaces {interface} switchport
R = LAN PHY; W = WAN PHY

5. What function is performed by the Switching Database Manager (SDM)?
From 30 seconds to 86 -400 seconds (24 hours)
Partition and tune the TCAM on some Catalyst switches into areas for different functions
The adjacency table
The Discard adjacency

6. What is the standard for 10 Gigabit Ethernet (10GbE)?
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
SVI
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
IEEE 802.3ae

7. What is the name of physical network segment where data packets can collide with one another when being sent?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Collision domain
Route caching and topology based
Down - static access - trunk or tunnel

8. What is the operational mode of a switch port that is a member of one VLAN?
A station must wait its turn to transmit; it can't transmit and receive at the same time
Switch(config)#interface {type}{module}/{number}
Static access
The Layer 3 engine

9. What is LAN PHY used for?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Carrier Sense Multiple Access Collision Detection
Interconnecting switches in a campus network
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

10. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config-if)#no switchport
Switch(config-if)#speed {10 | 100 | 1000 | auto}
SVI
Manually by administratively disabling and re-enabling the port

11. What CEF adjacency is used to switch packets that can't be forwarded normally?
Collision domain
The Drop adjacency
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable detect cause l2ptguard

12. Displays CEF adjacency table information
Static access or trunk
Switch(config)#interface vlan {vlan-id}
Switch#show adjacency [{interface}] [summary | detail]
Accelerated CEF (aCEF)

13. What is the standard for Gigabit Ethernet (1000 Mbps)?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch#show ip cef {interface} [detail]
IEEE 802.3z

14. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Static access
Slow response times - low throughput - runts and other input errors on the switch ports
Trunk or dynamic
Off

15. Displays the entire Forwarding Information Base (FIB)
Interconnecting switches in a campus network
Switch#show ip cef
Routing table and ARP table
Value - Mask - and Result (VMR)

16. What is the maximum cabling distance for 1000BASE-ZX?
Institute of Electrical and Electronics Engineers
Security and QoS ACLs
Switch#show interfaces status
70 km for 9 micron SMF; 100 km for 8 micron SMF

17. When can a switch start to learn source MAC addresses on incoming ports?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
The Layer 3 engine

18. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
The CEF entry version number
Switch(config)#errdisable detect cause bpduguard
With a mask value in addition to binary values to decide which keys in a table are relevant
Static access or dynamic

19. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
1000BASE-T full duplex followed by 1000BASE-T half duplex
Accelerated CEF (aCEF)
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

20. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config-if)#description {string}
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#errdisable detect cause pagp-flap
70 km for 9 micron SMF; 100 km for 8 micron SMF

21. What is 100BASE-T4?
SC fibre optic or RJ-45 UTP
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
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

22. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
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(config-if)#shutdown

23. What is 100BASE-FX?
The table of learned MAC addresses - ports - and VLAN information
Static access or dynamic
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

24. How are the TCAM Mask/Value pairs evaluated?
Switch(config)#errdisable detect cause dhcp-rate-limit
IEEE 802.3ae
In parallel revealing the best (longest) match in a single table lookup
Electromagnetic Interference

25. When do collisions occur?
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
When one station transmits at the same time as another on a shared medium
Switch(config)#errdisable detect cause dhcp-rate-limit
Only temporarily for debugging purposes

26. What is the maximum cabling distance for 10GBASE-LX4/LW4?
The table of learned MAC addresses - ports - and VLAN information
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#errdisable detect cause dhcp-rate-limit

27. What is the maximum cabling distance for 10GBASE-ER/EW?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
40 km
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 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

28. Configures the maximum ageing time for entries in the MAC address table
15 metres
American National Standards Institute
Switch(config)#mac address-table aging-time {seconds}
The Punt adjacency

29. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
CEF punt
IEEE 802.3z
CEF glean
Switch#show cef not-cef-switched

30. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Distributed CEF (dCEF)
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)

31. Specifies the timer for automatic re-enabling of error-disabled ports
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch(config)#errdisable detect cause security-violation
Static access or trunk
Switch(config)#errdisable recovery interval {seconds}

32. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch(config)#errdisable detect cause ilpower
SC fibre optic or RJ-45 UTP
Switch(config)#errdisable detect cause vmps
S = Short; L = Long; E = Extra-long

33. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Down - static access - trunk or tunnel
Tunnel
Half duplex

34. Enables error-disable for the presence of invalid GBIC or SFP modules
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
SC fibre optic or RJ-45 UTP
Switch(config)#errdisable detect cause gbic-invalid

35. What is the standard for Fast Ethernet (100 Mbps)?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
XENPAK - X2 - or SFP+
IEEE 802.3u
Switch(config-if)#speed {10 | 100 | 1000 | auto}

36. What is an interface-range macro?
LOU registers
A name assigned to a ranges of interfaces
The Punt adjacency
Switch(config)#errdisable detect cause l2ptguard

37. What is 10GBASE-LX4/LW4?
From 30 seconds to 86 -400 seconds (24 hours)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config-if)#shutdown
SC or MT-RJ

38. Enables error-disable for errors related to 802.1x security
Switch(config)#errdisable detect cause security-violation
A name assigned to a ranges of interfaces
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)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

39. What are the types of layer 3 switched interfaces
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
SVI or native routed interface
A switch port that has been shut down automatically due to a serious error condition

40. What is a GigaStack GBIC?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Packets that have been truncated before they were fully received
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
When one station transmits at the same time as another on a shared medium

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

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42. How are ports that are in error-disable state re-enabled by default?
Switch(config)#errdisable detect cause ilpower
Institute of Electrical and Electronics Engineers
Manually by administratively disabling and re-enabling the port
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

43. Creates a switched virtual interface (SVI) and enters interface configuration mode
The Layer 3 engine
Switch(config)#interface vlan {vlan-id}
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Tunnel

44. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
400 metres half duplex and 2000 metres full duplex
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Carrier Sense Multiple Access Collision Detection

45. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Switch(config)#errdisable detect cause loopback
Content-Addressable Memory
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

46. Adds a static entry to the MAC address table
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
Creating the VLAN
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch#show interfaces status

47. What is the maximum cabling distance for 10GBASE-CX4?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#switchport access vlan {vlan}
15 metres
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

48. Displays switch port information for a specified interface
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
Switch#show interfaces {interface} switchport
25 metres
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

49. Selects an interface-range macro and enters interface configuration mode
Switch#show ip cef {interface} [detail]
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)
Switch(config)#interface range macro {name}
Multilayer Switching

50. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
LOU registers
Switch#show cef drop
Forwarding Information Base
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]