總結挑戰 · Summary Challenge

Which two options are classified as link-state routing protocols? (Choose two.)以下哪兩個選項屬於鏈路狀態路由協定？（選兩項。）

A router has learned three possible routes that could be used to reach a destination network. These routes have been learned from three different routing protocols, OSPF, EIGRP and RIPv2. Which route will the router install in the routing table?某路由器學到了三條可用來到達某目的地網路的路由，這些路由分別由三種不同的路由協定 OSPF、EIGRP 和 RIPv2 學得。路由器會將哪一條路由安裝到路由表中？

How do link-state protocols limit the scope of route changes?鏈路狀態協定如何限制路由變動的影響範圍？

by supporting classless addressing透過支援無類別定址by sending the mask along with the address透過在傳送位址時一併傳送遮罩by sending only updates of a topology change透過只傳送拓樸變動的更新by segmenting the network into areas透過將網路劃分為多個區域

Match the OSPF neighbor states on a LAN with their correct positions in the right order.請將 LAN 上的 OSPF 鄰居狀態，依正確順序與其位置配對。

11	fullfull
22	two-waytwo-way
33	loadingloading
44	exstartexstart
55	INITINIT
66	downdown
77	exchangeexchange

Which two data structures do the link-state routing protocols use? (Choose two.)鏈路狀態路由協定會使用哪兩種資料結構？（選兩項。）

LSU databaseLSU 資料庫neighbors database鄰居資料庫link-state interfaces database鏈路狀態介面資料庫topology database拓樸資料庫next-hop database下一跳資料庫

What is the purpose of link-state advertisements?鏈路狀態通告的目的為何？

constructing a topological database建立拓樸資料庫specifying the cost to reach a destination指定到達某目的地的成本determining the best path to a destination決定到達目的地的最佳路徑verifying that a neighbor is still functioning驗證鄰居是否仍在運作

The SPF algorithm uses a value that on a Cisco router is inversely proportional to the bandwidth. What is this value called?SPF 演算法會使用一個在 Cisco 路由器上與頻寬成反比的值。這個值稱為什麼？

link cost鏈路成本hop count躍點數link state鏈路狀態MTUMTU

Refer to the figure. Which path will Router A, running OSPF, install in the routing table in order to reach 10.10.1.0/24?請參閱圖片。執行 OSPF 的路由器 A，為了到達 10.10.1.0/24，會將哪條路徑安裝到路由表中？

The path A-B-C路徑 A-B-CThe path A-D-C路徑 A-D-CThe path C-B-A路徑 C-B-AThe path A-C路徑 A-C

What is a concern of the default OSPF metric on Cisco routers?Cisco 路由器上預設的 OSPF 度量值有什麼問題？

Links with speeds greater than 10 Gbps will not be supported until the release of OSPFv4.速度超過 10 Gbps 的鏈路要到 OSPFv4 發布後才能支援。Links with speeds greater than 1 Gbps are converted to 10 Mbps for the purposes of OSPF cost calculation.在計算 OSPF 成本時，速度超過 1 Gbps 的鏈路會被換算為 10 Mbps。Links with speeds greater than 100 Mbps have a cost of 1.速度超過 100 Mbps 的鏈路成本為 1。Links with speeds greater than 1 Gbps require additional memory in the OSPF router or switch to calculate the larger costs.速度超過 1 Gbps 的鏈路需要 OSPF 路由器或交換器額外的記憶體，才能計算較大的成本。

Match the OSPF packet type with the correct description.請將 OSPF 封包類型與正確的說明配對。

LSULSU	sends specifically requested link-state records傳送特定被請求的鏈路狀態記錄
LSAckLSAck	acknowledges the other packet types確認其他封包類型
DBDDBD	requests specific link-state records from another router向另一台路由器請求特定的鏈路狀態記錄
LSRLSR	checks for database synchronization檢查資料庫是否同步
hellohello	discovers neighbors探索鄰居

Which two options represent when the OSPF routing protocol sends LSAs? (Choose two.)以下哪兩個選項代表 OSPF 路由協定傳送 LSA 的時機？（選兩項。）

periodically every 30 minutes每 30 分鐘定期傳送一次on topology change拓樸變動時periodically every 30 seconds每 30 秒定期傳送一次periodically every 60 minutes每 60 分鐘定期傳送一次periodically every 60 seconds每 60 秒定期傳送一次

Which three options represent information inside an OSPF hello packet that must be agreed upon before neighbor adjacency can be established? (Choose three.)以下哪三個選項是 OSPF hello 封包中，必須在建立鄰居鄰接關係之前先取得一致的資訊？（選三項。）

hello and dead intervalhello 間隔與 dead 間隔area IDarea IDauthentication data驗證資料neighbors鄰居router priority路由器優先權DR and BDR IPv4 addressesDR 與 BDR 的 IPv4 位址

Summary Challenge總結挑戰